414 



HITCHCOCK'S ANATOMY 



sion of the nerve of smell, and at the same time furnishing such 

 an arrangement, that the air containing the odor can be readily 

 drawn over it. This nerve is the Olfactory or first pair of 

 cranial nerves, which, as soon as it reaches the nostrils, is 

 divided into a great number of filaments, and these are dis- 

 tributed upon the mucous membrane —called Pituitary — al- 

 ready described. The fifth pair of cranial nerves also sends 

 branches to this membrane, by means of which it is that 

 sneezing is effected. 



765. Smell under the Control of the Will.— The sense 

 of smell is somewhat under the control of the will, since the 

 air containing the odoriferous particles can be carried over the 

 nostrils or rejected at pleasure, and it can also be cultivated 

 to a great extent, although some persons are naturally more 

 sensitive to odors than others. It is related that a gentleman 

 w 7 ho had a great antipathy to cats, could tell if there was one 

 in the next room by smell alone. And the blind boy Mitchell 

 always formed a favorable or unfavorable impression of a 

 stranger by this sense. 



THE SENSE OF SMELL IN ANIMALS. 



766. The sense of smell is most perfectly developed in air- 

 breathing animals, although many which live in the water, can 

 distinguish odors or scents to a considerable distance. 



767. Smell in Mammals. — In Mammalia the mucous 

 membrane covering the turbinal bones is supplied with ol- 

 factive nerves. And in carnivorous animals, like the Lion 

 and Tiger, these bones are split up into several laminae, giving 

 them arborescent or tree-shaped forms, so that the membrane 



Why are the turbinal bones placed here ? What is the nerve of smelling? 765. To 

 what extent is smell under the control of the will ? What carious facts in this connec- 

 tion ? 766. In what animals is this sense the most perfectly developed? 767. Among? 

 what mammals do we find this sense in the greatest perfection? What peculiarity in 

 the turbinal bones in the lion ? 



