ILLUSTRATIONS XXXI 



FIG. PAGE 



199. Tracing showing the action of pituitrin on the uterine contractions and 



blood pressure in a dog 812 



200. Tracing showing the constructing action of pituitrin on the bronchioles and 



its effect on blood pressure in a spinal dog 813 



201. Showing the appearance before and after the onset of acromegalic symptoms 815 



202. Hand of a person affected with acrornegaly 817 



203. The evolution of the nervous system 829 



204. Normal cell from the anterior horn, stained to show Nissl's granules . . . 831 

 20.1. Arborization of collaterals from the posterior root fibers around the cells of 



the posterior horn 832 



200. Part of an anterior cormial cell from the calf's spinal cord stained to show 



neurofibrils 833 



207. Schema of simple reflex arc 833 



208. Diagram of nervous system of segmented invertebrate 834 



209. Diagram illustrating the effect of areas of narcosis on the strength of the 



nerve impulse 839 



210. The recovery of excitability in the nerve fiber after the passage of a nerve 



impulse 840 



21.1. Degeneration and regeneration of a sectioned nerve fiber . , 847 



212. Evolution of the sense organs 855 



213. Cold spots and heat spots of an area of skin of the right hand 860 



214. Diagram showing the segmented arrangement of the sensory nerves . . . 867 



215. Diagram of the afferent paths followed by sensory impulses within the spinal 



cord and brain 869 



216. Afferent paths connecting the retina with the visual area of the cerebral 



cortex 881 



217. Outer aspect of the brain of the chimpanzee showing the position of the motor 



centers 885 



218. Diagram to illustrate the different arrangements of the internuncial neurons 



of the voluntary and autonomic nervous systems 894 



219. Diagram of the autonomic nervous system. (Color Plate.) 894 



220. Diagram showing the main parts of the autonomic nervous system. (Color 



Plate.) 896 



221. Schematic representation of the autonomic nervous system. (Color Plate.) 898 



222. Diagram of an axon reflex in a sensory nerve fiber of the skin 899 



223. Electromyogram of the voluntary contraction of the flexor muscles . . . 907 



224. The contraction of a single fiber of the sartorius muscle of the frog . . . 907 



225. The all or none nature of the contraction of a single fiber of skeletal muscle 909 



226. Eeciprocal inhibition 916 



227. Kecords of the contraction of the isolated extensor muscle of the knee of 



the cat 917 



228. Compensatory movements of the eyes and fins of the dogfish 919 



229. The semicircular canals of the ear 919 



230. A tracing of the knee-jerks of a normal man and of a man with a cerebellar 



injury 922 



231. Schema of the parts of the mammalian cerebellum 929 



232. Diagrams to represent a ventral view of the left half and a dorsal view of 



the right half of the cerebellum 930 



