The Elements of Physiology and Hygiene: A Text-book for Educational Institutions

D. Appleton, 1878 - 485 páginas

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Página 33 - Imperious Caesar, dead and turn'd to clay, Might stop a hole to keep the wind 'away: O, that that earth which kept the world in awe Should patch a wall to expel the winter's flaw!— But soft!
Página 473 - Astronomy, accompanied with numerous Illustrations, a Colored representation of the Solar, Stellar, and Nebular Spectra, and Celestial Charts of the Northern and the Southern Hemispheres.
Página 473 - FIRST BOOK OF BOTANY. Designed to Cultivate the Observing Powers of Children. With 300 Engravings, New and Cheaper Edition. Crown 8vo.
Página 311 - It may be said that these are mere mechanical actions, and have nothing to do with the acts which we associate with intelligence. But let us consider what takes place in such an act as reading aloud. In this case, the whole attention of the mind is, or ought to be, bent upon the subject-matter of the book ; while a multitude of most delicate muscular actions are going on, of which the reader is not in the slightest degree aware. Thus the book is held in the hand, at the right distance from the eyes...
Página 12 - An'd lastly, when we try to ascertain what happens iu the eye when that organ is adjusted to different distances : or what in a nerve when it is excited : or of what materials flesh and blood are made : or in virtue of what mechanism it is that a sudden pain makes one start — we have to call into operation all the methods of inductive and deductive logic ; all the resources of physics and chemistry ; and all the delicacies of the art of experiment.
Página 5 - A text-book for educational institutions, and a valuable elementary work for students of medicine. The greater portion is from the pen of Professor Huxley, adapted by Dr. Youmans to the circumstances and requirements of American education. The eminent claim of Professor Huxley's " Elementary Physiology " is, that, while up to the times, it is trustworthy in its presentation of the subject ; while rejecting discredited doctrines and doubtful speculations, it embodies the latest results that are established,...
Página 360 - Invariably it will be found on examination that a truly scrofulous disease is caused by a vitiated air, and it is not always necessary that there should have been a prolonged stay in such an atmosphere. Often a few hours each day is sufficient...
Página 311 - ... of anything but the sense of the words in the book, — in other words, they are reflex acts. " The reflex actions proper to the spinal cord itself are natural, and are involved in the structure of the cord and the properties of its constituents. By the help of the brain we may acquire an affinity of artificial reflex actions ; that is to say, an action may require all our attention and all our volition for its first or second or third performance, but by frequent repetition it becomes in a manner...
Página 312 - There is a story, which is credible enough, though it may not be true, of a practical joker, who, seeing a discharged veteran carrying home his dinner, suddenly called out, 'Attention!' whereupon the man instantly brought his hands down, and lost his mutton and potatoes in the gutter. The drill had been thorough, and its effects had become embodied in the man's nervous structure...
Página 275 - There were two cats in the house, one of which went by thii name, and they were rarely if ever in the drawing-room. At this time Mrs. A. had no idea that the sight of the cat was an illusion. When she was asked to touch it, she got up for the purpose, and seemed as if she were pursuing something which moved away. She followed a few steps, and then said,

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