Public School Domestic Science Part 6

HONEY.

Honey is a form of sugar gathered by bees from the nectar of flowering plants, and stored by them in cells. Honey contains water 16.13, fruit sugar 78.74, cane sugar 2.69, nitrogenous matter 1.29, mineral matter 0.12 per cent. (Konig.)

Grains.

While the grains contain less proteid than the legumes, they are more valuable on account of the variety of the nutrients contained in them, and are more easily adapted to the demands of the appet.i.te. They, however, require long, slow cooking in order to soften the fibre and render the starch more soluble. Among the most important we may place:

WHEAT.

A wheat kernel may be subdivided into three layers. The first or outer one contains the bran; second, the gluten, fats and salts; third, the starch. Some of the mineral matter for which wheat is so valuable is contained in the bran, hence the value of at least a portion of that part of the wheat being included in bread flour--not by the addition of coa.r.s.e bran (which is indigestible) to the ordinary flour, but by the refining process employed in producing whole wheat flour. While wheat is used in other forms, its princ.i.p.al use as food is in the form of flour.

The following table, giving the composition of bread from wheat and maize, will be of interest (Stone):--

COMPOSITION OF BREAD FROM WHEAT AND MAIZE.

-------------------------+-------------------------------------------- | In Air-Dry Material.

+------+-----+-----+-------+--------+-------- | | | | | |Nitrogen |Water.| Ash.| Fat.| Fibre.|Protein.| free | | | | | |extract.

-------------------------+------+-----+-----+-------+--------+-------- |P.ct. |P.ct.|P.ct.| P.ct. | P.ct. | P.ct.

Bread from whole winter | | | | | | wheat | 3.07 | 2.33| 1.22| 2.86 | 15.70 | 74.82 Bread from whole spring | | | | | | wheat | 7.46 | 1.69| 1.24| 2.80 | 15.26 | 71.55 Bread from fine flour, | | | | | | winter wheat |10.39 | .59| .32| .44 | 11.94 | 76.32 Bread from fine flour, | | | | | | spring wheat | 8.00 | .43| .47| .39 | 14.41 | 76.30 Corn bread from whole | | | | | | maize | 3.40 | 1.88| 4.14| 2.53 | 12.88 | 75.17 -------------------------+------+-----+-----+-------+--------+--------

-------------------------+------------------------------------------ | In Dry Matter +------+------+--------+---------+--------- | | | | | Nitrogen | Ash. | Fat. | Fibre. | Protein.| free | | | | | extract.

-------------------------+------+------+--------+---------+--------- |P.ct. |P.ct. | P.ct. | P.ct. | P.ct.

Bread from whole winter | | | | | wheat | 2.40 | 1.25 | 2.95 | 16.20 | 77.20 Bread from whole spring | | | | | wheat | 1.82 | 1.34 | 3.02 | 16.49 | 77.33 Bread from fine flour, | | | | | winter wheat | .66 | .35 | .49 | 13.33 | 85.17 Bread from fine flour, | | | | | spring wheat | .47 | .51 | .42 | 15.66 | 82.94 Corn bread from whole | | | | | maize | 1.95 | 4.29 | 2.62 | 13.33 | 77.81 -------------------------+------+------+--------+---------+---------

BREAD.

The most valuable food product manufactured from flour is bread.

Bread contains so many of the ingredients required to nourish the body, viz.: fat, proteid, salts, sugar and starch, that it may well be termed the "staff of life." As it does not contain enough fat for a perfect food the addition of b.u.t.ter to it renders it more valuable as an article of diet. Mrs. Ellen H. Richards gives the following explanation of what const.i.tutes ideal bread: "(1) It should retain as much as possible of the nutritive principles of the grain from which it is made; (2) it should be prepared in such a manner as to secure the complete a.s.similation of these nutritive principles; (3) it should be light and porous, so as to allow the digestive juices to penetrate it quickly and thoroughly; (4) it should be nearly or quite free from coa.r.s.e bran, which causes too rapid muscular action to allow of complete digestion. This effect is also produced when the bread is sour." Bread is made from a combination of flour, liquid (either milk or water), and a vegetable ferment called yeast (see yeast recipes).

The yeast acts slowly or rapidly according to the temperature to which it is exposed. The starch has to be changed by the ferment called diastase (diastase is a vegetable ferment which converts starchy foods into a soluble material called maltose) into sugar, and the sugar into alcohol and carbonic acid gas (carbon dioxide), when it makes itself known by the bubbles which appear and the gradual swelling of the whole ma.s.s. It is the effect of the carbonic acid gas upon the gluten, which, when checked at the proper time before the ferment becomes acetic (sour) by baking, produces the sweet, wholesome bread which is the pride of all good housekeepers. The kneading of bread is to break up the gas bubbles into small portions in order that there may be no large holes and the fermentation be equal throughout. The loaf is baked in order to kill the ferment, to render the starch soluble, to expand the carbonic acid gas and drive off the alcohol, to stiffen the gluten and to form a crust which shall have a pleasant flavor. Much of the indigestibility of bread is owing to the imperfect baking; unless the interior of the loaf has reached the sterilizing point, 212 F., the bacteria contained in the yeast will not be killed, and some of the gas will remain in the centre of the loaf. The scientific method of baking bread is to fix the air cells as quickly as possible at first. This can be done better by baking the bread in small loaves in separate pans, thereby securing a uniform heat and more crust, which is considered to be the most easily digested part of the bread. Some cooks consider that long, slow baking produces a more desirable flavor and renders bread more digestible. One hundred pounds of flour will make an average of one hundred and thirty-five pounds of bread. This increase of weight is due to the addition of water.

MACARONI.

Macaroni is a flour preparation of great food value. It contains about six per cent. more gluten than bread, and is regarded by Sir Henry Thompson as equal to meat for flesh-forming purposes. Dieticians say that macaroni, spaghetti and vermicelli are not used so extensively as their value deserves.

BUCKWHEAT.

Buckwheat is the least important of the cereals.

RYE.

Rye is almost equal to wheat in nutritive value. Its treatment in regard to bread making is similar to that of wheat.

CORN.

Corn contains fat, proteid and starch, and produces heat and energy.

It is very fattening, and when eaten as a vegetable is considered difficult of digestion. Cornmeal is a wholesome food; it contains more fat than wheat flour, and less mineral matter.

RICE.

Rice const.i.tutes a staple food of a great many of the world's inhabitants. It contains more starch than any other cereal, but when properly cooked is very easily digested. It should be combined with some animal food, as it contains too little nitrogen to satisfy the demands of the system. It forms a wholesome combination with fruit, such as apples, peaches, prunes, berries, etc.

BARLEY.

Barley is almost equal to wheat in nutritive value. It contains more fat, mineral matter and cellulose (cellulose is often called indigestible fibre, as it resists the solvent action of the digestive juices, and is of no value as a nutrient), and less proteid and digestible carbohydrates.

OATMEAL.

Oatmeal is one of the most valuable foods. Oats contain fat, proteid, salts and cellulose, in addition to a large percentage of starch. The nutritive value of oatmeal is great, but much depends upon the manner of cooking. (See recipes.) People who eat much oatmeal should lead a vigorous outdoor life. The following a.n.a.lysis of oatmeal is given (Letheby):--

Nitrogenous matter 12.6 per cent.

Carbohydrates, starch, etc. 63.8 "

Fatty matter 5.6 "

Mineral matter 3.0 "

Water 15.0 "

---- Total 100.0

Vegetables.

Legumes--peas, beans and lentils--have an exceedingly leathery envelope when old; and unless soaked for a long time in cold water--in order to soften the woody fibre--and are then cooked slowly for some hours, are very indigestible. Pea and bean soups are considered very nutritious. Lentils grow in France; they are dried and split, in which form they are used in soups.

POTATOES.

Potatoes are the most popular of all the tubers. As an article of diet they possess little nutritive value, being about three-fourths water.

They contain some mineral matter, hence the reason why they are better boiled and baked in their skins, so as to prevent the escape of the salts into the water. Potatoes are more easily digested when baked than cooked in any other form.

BEETS.

Beets contain between 85 and 90 per cent. of starch and sugar, some salts, and a little over one per cent. of proteid matter. Young beets, either in the form of a vegetable or a salad, are considered to be very wholesome.

CARROTS, TURNIPS, PARSNIPS, OYSTER PLANT.

Carrots, turnips, parsnips and oyster plant, although containing a large percentage of water, are considered valuable as nutrients, the turnip being the least nutritious.

GREEN VEGETABLES.

Green vegetables do not contain much nutriment, and are chiefly valuable as affording a pleasing variety in diet; also for supplying mineral matter and some acids. In this cla.s.s we may include cabbage, cauliflower, spinach, lettuce and celery.

TOMATOES.

Tomatoes are wholesome vegetables; on account of the oxalic acid they contain they do not always agree with people of delicate digestion.

CUc.u.mBERS.