A Guide To The Scientific Knowledge Of Things Familiar - novelonlinefull.com
You’re read light novel A Guide To The Scientific Knowledge Of Things Familiar Part 94 online at NovelOnlineFull.com. Please use the follow button to get notification about the latest chapter next time when you visit NovelOnlineFull.com. Use F11 button to read novel in full-screen(PC only). Drop by anytime you want to read free – fast – latest novel. It’s great if you could leave a comment, share your opinion about the new chapters, new novel with others on the internet. We’ll do our best to bring you the finest, latest novel everyday. Enjoy
Q. _Why can we not HEAR in sleep?_
A. Because the drum or "TYMPANUM of the ear" is placid and at rest.
Q. _Why can we not TASTE when we are asleep?_
A. Because the nerves _at the end of the tongue_ (called papillae) are inactive and at rest.
Q. _Why can we not FEEL when we are asleep?_
A. Because the _ends of the nerves_ (called papillae), situated in the skin, are inactive and at rest.
Q. _Why have persons in sleep no WILL of their own, but may be moved at the will of ANY one?_
A. Because the "CEREBELLUM" (or _posterior_ part of the brain) is inactive and at rest.
Q. _Why have DREAMERS no power of JUDGMENT or REASON?_
A. Because the "CEREBRUM" (or _front_ of the brain) is inactive and at rest.
Q. _Why are DREAMS such FOOLISH and INCONSISTENT things?_
A. Because the "PINEAL GLAND" is acting _without the brain_; and the _faculty of thinking_ exists in the "PINEAL GLAND," but the _faculty of judgment_ in the "CEREBRUM of the brain."
The cerebrum of the brain occupies the top and front of the skull. The PINEAL GLAND is a small conical gland (about the size of a pea) _in the brain_.
Q. _Why do some persons LOSE all POWER of SENSATION?_
A. Because the "CEREBRUM" (or _front_ of their brain) _has been injured_.
Q. _Why are many persons IDIOTS?_
A. Because the "CEREBELLUM of the brain" _has been removed_ by some accident, or _injured by some disease_.
The cerebellum is all the posterior part of the brain.
Q. _Why does a person FEEL when he is TOUCHED?_
A. The ends of certain nerves (called PAPILLae) situated in the skin _erect themselves_ when touched, and produce a nervous sensation called FEELING.
Q. _Why are persons able to TASTE DIFFERENT FLAVOURS?_
A. Because the "PAPILLae" of the tongue and palate _erect themselves_ when food touches them, and produce a nervous sensation called TASTE.
Q. _Why do very OLD people LOSE the power of VOLITION, SENSATION, and THOUGHT?_
A. Because their _brain ossifies_; and as the "_cerebrum_" (or _front_ of the brain) goes, they lose the power of _sensation and reason_; and as the "_cerebellum_" (or _posterior_ part of the brain) goes, they lose the power of _volition_.
Q. _Why are OLD people UNABLE to WALK?_
A. Because their _muscles become rigid_.
GLOSSARY.
ACETIC ACID, commonly called Distilled Vinegar.
CITRIC " " Juice of Lemons.
NITRIC " " Aqua Fortis.
OXALIC " " Salt of Lemons.
SULPHURIC " " Oil of Vitriol.
SULPHATE OF LIME " Plaster of Paris.
" MAGNESIA " Epsom Salts.
" SODA " Glauber Salts.
" ZINC " White Vitriol.
NITRATE OF SILVER " Lunar Caustic.
ACETATE OF COPPER " Verdigris.
MURIATE OF SODA " Table Salt.
TARTRATE OF POTASH " Tartar Emetic.
CARBONATE OF AMMONIA " Smelling Salts.
" LIME " Chalk, Marble, &c.
SUPER-ACETATE OF LEAD " Sugar of Lead.
OXIDE OF LEAD " Goulard.
SUBLIMATES are chemical preparations, the basis of which is quicksilver. In CORROSIVE SUBLIMATES, the quicksilver is _extinguished_, either by vitriol, potter's clay, or some other ingredient.
SUBLIMATION is a similar process to distillation; only _solids_(such as metals) are employed, instead of _liquids_.
Thus the fine _blue_ used by painters is a sublimate, and made thus:--Take 2 parts of quicksilver, 3 flower of brimstone, 8 sal ammoniac; and (having ground them) put them with the quicksilver into a gla.s.s retort, luted at the bottom; place the retort in a sand-heat; and (when the moisture is given off) you will have a splendid blue sublimate for painting.
FINISH.
