A treatise on physiology and hygiene for educational institutions and general readers .. . said: So, puss, I shall know you next time. 23. Of all the senses, touch is considered the least liable to error;yet, if that part of the skin by which the sense is exercised is removedfrom its customary position, a false impression may be created in themind. This is well illustrated by an experiment, which dates from 21. The simplicity of touch ? What does it teach us ? 22. Importance of the sense of touch to the development of the other senses? 23. Liability of touch to err ? Describe the illustration.
A treatise on physiology and hygiene for educational institutions and general readers .. . said: So, puss, I shall know you next time. 23. Of all the senses, touch is considered the least liable to error;yet, if that part of the skin by which the sense is exercised is removedfrom its customary position, a false impression may be created in themind. This is well illustrated by an experiment, which dates from 21. The simplicity of touch ? What does it teach us ? 22. Importance of the sense of touch to the development of the other senses? 23. Liability of touch to err ? Describe the illustration. THE SPECIAL SENSES. 229 the time of Aristotle. If we cross the middle finger behind the fore-finger, and then roll a marble or some small object upon the tips ofthe fingers (see Fig. 54), the impression will be that two marblesare felt. If the fingers, thus transposed, be applied to the end ofthe tongue, two tongues will be felt. When the nose is accidentallydestroyed, the surgeon sometimes performs an operation for thepurpose of forming a new one, by transplanting a partially removed. Fig. 54. piece of the skin of the forehead upon the injured part; then, ifthe new nose be touched or pinched, the feeling is referred to theforehead. This fact illustrates one important truth—that the nerveswill re-unite after they have been cut and feeling will be restored;if it were otherwise, a succession of slight cuts upon the fingerswould seriously impair their tactile sensibility. 24. The Delicacy of Touch.—Although the hand is the properorgan of this sense, yet it is exercised by various parts of the body,their degree of sensibility being proportional to the number ofpapillae they contain. The varying degrees of tactile delicacy ofthe different parts of the surface have been measured in an ingen-ious manner, by means of a pairof compasses, tipped with smallpieces of cork. The two points of the compasses are touched atthe same moment to the skin, the eyes being closed, and it is found
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Keywords: ., bookcentury1800, bookdecade1, booksubjectphysiology, bookyear1884
