Standard animal physiology

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Trang 97 - ... from the back part of the globe. The flame of a candle held before the cornea may be seen inverted at the back of the eye, increasing in size as the candle is brought near, diminishing as it retires, and always moving in a direction opposite to that of the flame. The adaptation of the eye to distinct vision at every distance beyond that of a few inches, is extremely remarkable...
Trang 91 - If the air is perfectly still, and no current allowed in the nose, by suspending the breathing through that organ, the strongest smells will make no impression. In some animals the sense of smell is acute and powerful, beyond the conception of human beings ; thus, a dog, by the acuteness of this sense, will distinguish the footsteps of his master amid those of a hundred other people, and can thus trace him for miles, although he has been a long while out of sight ; pointers also scent game at a great...
Trang 39 - I, the mitral valve; m, the left ventricle, from which proceeds the aorta, whose arch is indicated by A, and the descending portion by n, none of Its branches...
Trang 76 - ... operations of the complicated machine. On each side of the back-bone there are several layers of strong muscles, which are fixed by tendons to every projection of the numerous bones composing the spine. These muscles keep the trunk of the body erect, and also permit of the varied motions of the back. There are a multitude of small muscles about the face, head, and eyes, whose various action imparts that expression to the human countenance which indicates the prevailing feelings and passions of...
Trang 67 - ... to the liver itself, and called the gall-bladder. The bile is a thin, greenish-yellow, bitter fluid. Sometimes it is olive-brown in color ; but, when acted upon by the gastric juice, it takes on a distinctly yellow or greenish hue ; hence the appearance of vomited bile. The chief use of the bile is to digest the fatty parts of the food, upon which the gastric juice does not act. The bile also aids in separating the nutritious from the useless parts of the food.1 The pancreatic juice is very much...
Trang 91 - The effluvia proceeding from bodies, and which imparts their peculiar odour must pass in a stream or current through the nose before the odour is perceptible. If the air is perfectly still, and no current allowed in the nose, by suspending the breathing through that organ, the strongest smells will make no impression. In some animals the sense of smell is acute and powerful, beyond the conception of human beings; thus a dog, by the acuteness of this sense, will distinguish the footsteps of his master...
Trang 89 - ... the unwound cocoons, which are sorted accordingly ; and the Indian muslin-weaver contrives by the delicacy of his touch to make the finest cambric in a loom of such simple construction that European fingers could at best propose to make a piece of canvas at it." The highest development of the sense of touch is met with in blind persons — a circumstance which is to be attributed, for the most part, to the concentration of the attention, and of the powers of recollection and comparison which...
Trang 86 - Electricity, by Dr Ferguson. 3 6 Scientific Charts — Sheet 1. Matter and Motion, Is. 6d. ; 2 & 3, Mechanics, each 1 6 Each sheet mounted on rollers, 4s. 6d. ; varnished. 5 6 LATIN. . Ruddiman's Latin Rudiments. 0 10 Latin Grammar, Elementary, 2s. ; Advanced Grammar. 4 0 Latin Exercises, Elementary, Is. 6d. ; Advanced Exercises... 2 6 Key to Advanced Latin Exercises 2 0 Phsedrus's Fables. 1 6 Nepos 2 0 Csesar 2 6 Sallust 1 6 Quintus Curtius 3 0 Ovid. 3 0 Horace 3 0 Virgil— Bucolics, and JEneid...
Trang 45 - ... contractions or beatings, and partly by the contractions of the coats of the arteries. The rate of pulsation in a person in the prime of life, is from 65 to 75 beats in a minute. In childhood the pulse is much quicker — from 100 to 140 beats; and in old age it again becomes slower than the medium standard. In fevers, inflammations, and other diseases of excitement, the action of the heart is increased sometimes to...
Trang 86 - Introduction to the Sciences. 1 0 Laws of Matter and Motion 0 10 Mechanics 1 0 Hydrostatics, Hydraulics, and Pneumatics 0 10 Scientific Reader 2 0 Practical Chemistry, by Dr S. Macadam. 2 6 Inorganic Chemistry, by Professor Wilson 4 0 Zoology. 2 6 Animal Physiology. 1 6 Standard AnimalPhysiology, Pt L 2d.

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