The Young Marooners on the Florida Coast Part 3

And from that time forth Mary never heard Robert allude to her moonlight; indeed he was so much cut down by this story, that for a day or two he was more than usually quiet. At last, however, an incident occurred which restored to him the ascendancy he had hitherto held over his cousin, by ill.u.s.trating the importance of possessing a proper store of sound, practical knowledge.

The two had gone to examine an old well, near the house, and were speculating upon the possibility of cleansing it from its trash and other impurities, so as to be fit for use, when Harold's knife slipped from his hand and fell down the well. It did not fall into the water, but was caught by a half decayed board that floated on its surface.

"I cannot afford to lose that knife," said Harold, looking around for something to aid his descent, "I must go down after it."

"You had better be careful how you do that," interposed Robert, "it may not be safe."

"What," asked Harold, "are you afraid of the well's caving?"

"Not so much of its caving," replied Robert, "as of the bad air that may have collected at the bottom."

Harold snuffed at the well's mouth to detect such ill odours as might be there, and said, "I perceive no smell."

"You mistake my meaning," remarked Robert. "In all old wells, vaults and places under ground, there is apt to collect a kind of air or gas, like that which comes from burning charcoal, that will quickly suffocate any one who breathes it. Many a person has lost his life by going into such a place without testing it beforehand."

"Can you tell whether there is any of it here?" asked Harold.

"Very easily, with a little fire," answered Robert. "AIR THAT WILL NOT SUPPORT FLAME, WILL NOT SUPPORT LIFE."

They stuck a splinter of rich pine in the cleft end of a pole, and, lighting it by a match, let it softly down the well. To Harold's astonishment the flame was extinguished as suddenly as if it had been dipped in water, before it had gone half way to the bottom.

"Stop, let us try that experiment again," said he.

They tried it repeatedly, and with the same result, except that the heavy poisonous air below being stirred by the pole, had become somewhat mingled with the pure air above, and the flame was not extinguished quite so suddenly as at first; it burnt more and more dimly as it descended, and then went out.

"I do believe there is something there," said he at last, "and I certainly shall not go down, as I intended. But how am I to get my knife?"

"By using father's magnet, which is a strong one," replied Robert. "Let us go and ask him for it."

On relating the circ.u.mstances to Dr. Gordon, he said, "You have made a most fortunate escape, Harold. Had you descended that well, filled as it is with carbonic acid gas, you would have become suddenly sick and faint, and would probably have fallen senseless before you could have called for help. _Make it a rule never to descend such a place without first trying the purity of its air, as you did just now_."

"But can we not get that bad air out?" asked Harold.

"Yes, by various means, and some of them very easy," replied his uncle.

"One is by exploding gunpowder as far down as possible; another is by lowering down and drawing up many times a thickly leaved bush, so as to pump out the foul air, or at least to mix it largely with the pure. But your knife can be obtained without all that trouble. Robert, can you not put him upon a plan?"

"I have already mentioned it, and we have come to ask if you will not let us have your magnet," replied Robert. "But," continued he smilingly, "I do not think that we shall have any need this time for the looking-gla.s.s."

Harold looked from one to the other for an explanation, and his uncle said:

"Last year Robert dropped his knife down a well, as you did, and proposed to recover it by means of a strong magnet tied to a string.

But the well was deep and very dark, and after fishing a long time in vain, he came to me for help. I made him bring a large looking-gla.s.s from the house, and by means of it reflected such a body of sun-light down the well that we could plainly see his knife at the bottom, stowed away in a corner. The magnet was strong enough to bring it safely to the top. You also may try the experiment."

With thanks, Harold took the offered magnet, tied it to a string, and soon recovered his knife.

CHAPTER V

RILEY--A THUNDERSTORM--ASCERTAINING THE DISTANCE OF OBJECTS BY SOUND--SECURITY AGAINST LIGHTNING--MEANS OF RECOVERING LIFE FROM APPARENT DEATH BY LIGHTNING

A few days after this incident another visitor was seen coming from Fort Brooke. This person was not a horseman, but some one in a boat, who seemed even from a distance to possess singular dexterity in the use of the paddle. His boat glided over the smooth surface of the bay as if propelled less by his exertions than by his will. Dr. Gordon viewed him through the spy gla.s.s, and soon decided him to be an Indian, who was probably bringing something to sell.

It so turned out. He was a half-breed, by the name of Riley, who frequently visited the fort with venison and turkeys to sell, and who on the present occasion brought with him in addition a fine green turtle.

Major Burke, conceiving that his friends at Bellevue would prize these delicacies more than they at the fort, to whom they were no longer rarities, had directed the Indian to bring them, with his compliments, to Dr. Gordon.

Riley was a fine looking fellow, of about thirty years of age--tall, keen-eyed, straight as an arrow, and with a pleasing open countenance.

He brought a note from the fort, recommending him for honesty and faithfulness.

Dr. Gordon was so much pleased with his general appearance, that he engaged him to return the following week with another supply of game, and prepared to remain several days, in case he should be needed in raising the timbers of the new house.

Toward the close of the week, the weather gave indications of a change.

A heavy looking cloud rose slowly from the west, and came towards them, muttering and growling in great anger. It was a tropical thunderstorm.

The distant growls were soon converted into peals. The flashes increased rapidly in number and intensity, and became terrific. Mary and Frank nestled close to their father; and even stout-hearted Harold looked grave, as though he did not feel quite so comfortable as usual.

"That flash was uncommonly keen," Robert remarked, with an unsteady voice. "Do you not think, father, it was very near?"

Instead of replying, his father appeared to be busy counting; and when the crash of thunder was heard, jarring their ears, and making the earth quiver, he replied,

"Not very. Certainly not within a mile."

"But, uncle, can you calculate the distance of the lightning?" Harold asked.

"Unquestionably, or I should not have spoken with so much confidence.

Robert imagined, as most people do, that a flash is near in proportion to its brightness; but that is no criterion. You must calculate its distance by the time which elapses between the flash and the report.

Sound travels at the rate of about a mile in five seconds. Should any of you like to calculate the distance of the next flash, put your finger on your pulse, and count the number of beats before you hear the thunder."

An opportunity soon occurred. A vivid flash was followed after a few seconds by a roll, and then by a peal of thunder. All were busy counting their pulses. Mary ceased when she heard the first roll, exclaiming "Five!" The others held on until they heard the loud report, and said "Seven." Dr. Gordon reported only six beats of his own pulse, remarking,

"That flash discharged itself just one mile distant. Our pulses are quicker than seconds; and yours quicker than mine. Sound will travel a mile during six beats of a person of my age, and during seven of persons of yours."

"But, father," argued Mary, "I surely heard the thunder rolling when I said _five_."

"So did I," he answered; "and that proves that although the lightning discharged itself upon the earth at the distance of a mile, it _commenced_ to flow from a point nearer overhead."

The young people were so deeply interested in these calculations, that they felt less keenly than they could have imagined possible the discomfort of the storm. This was Dr. Gordon's intention. But at last Mary and Frank winced so uneasily, when flashes of unusual brightness appeared, that their father remarked, "It is a weakness, my children, to be afraid of lightning that is seen and of thunder that is heard--_they are spent and gone_. Persons never see the flash that kills them--it does its work before they can see, hear, or feel."

At this instant came a flash so keen, that it seemed to blaze into their very eyes, and almost simultaneously came a report like the discharge of a cannon. Dr. Gordon's lecture was in vain; all except him and Harold started to their feet. Frank ran screaming to his father. Mary rushed to a pile of bedding, and covered herself with the bed-clothing. Robert looked at Mary's refuge, with a manifest desire to seek a place beside her. Harold fixed his eye upon his uncle, with a glance of keen inquiry.

"This is becoming serious," said the Doctor anxiously. "Something on the premises has been struck. Stay here, children, while I look after the servants. _Your safest place is in the middle of the room_, as far as possible from the chimney and walls, along which the lightning pa.s.ses."

While giving these directions, at the same time that he seized his hat, cloak, and umbrella, William rushed in to say that the horses had been struck down and killed. They were stabled under a shelter erected near a tall palmetto--a tree so seldom struck by lightning, as to be regarded by the Indians as exempt from danger. The fluid had descended the trunk, tearing a great hole in the ground, and jarring down a part of the loose enclosure.

"Call all hands!" said the Doctor. "Throw off the shelter instantly, to let the rain pour upon them; and bring also your buckets and pails."