720 "Journal of Comparative Neurology and Psychology. 



REFERENCES. 

 Donaldson, Henry H., and Hoke^ G. W. 



1905. On the areas of the axis cylinder and medullary sheath as seen 

 in the cross sections of the spinal neres of the vertebrates. The 

 Journal of Comparative Neurology and Psychologi/, Vol. 15, 

 No. 1, pp. 1-16. 

 Donaldson, Henry H., and Schoemaker, Daniel M. 



1900. Observations on the weight and length of the central nervous system 

 and of the legs in frogs of different sizes. The Journal of 

 Comparative Neurology, Vol. 10, No. 1, pp. 109-132. 

 Donaldson, Henry H. 



1903. On a law determining the number of medullated nerve fibers 

 innervating the thigh, shank and foot of the frog, Rana vires- 

 cens. The Journal of Comparative Neurology, Vol. 13, No. 3, 

 pp. 224-257. 

 Dunn, Elizabeth H. 



1900. The number and size of the nerve fibers innervating the skin and 

 muscles of the thigh in the frog (Rana virescens brachy- 

 cephala, Cope). The Journal of Comparative Neurology, Vol. 

 10, No. 2. pp. 218-242. 

 1902. On the number and on the relation between diameter and distri- 

 bution of the nerve fibers innervating the leg of the frog, 

 Rana virescens brachycephala. Cope. The Journal of Compara- 

 tive Neurology, Vol. 12, No. 4, pp. 297-328. 

 Gaupp, Ernst 



1896-1901. A. Ecker's und R. Wiedersheim's Anatomie des Frosches. 

 BraMnschiceig. 

 Hardesty, Irving 



1899. The number and arrangement of the fibers forming the spinal 

 nerves of the frog (Rana virescens). The Journal of Com- 

 parative Neurology, Vol. 9, No. 2, pp. 64-112. 

 Herrick, C. Judson 



1902. A note on the significance of the size of nerve fibers in fishes. 

 The Journal of Comparative Neurology^ Vol. 12, No. 4, pp. 

 329-334. 

 Johnston, J. B. 



1908. On the significance of the caliber of the parts of the neurone in 

 vertebrates. The Journal of Comparative Neurology and Psy- 

 chology, Vol. 18, No. 6, pp. 609-618. 

 Rivers, W. H. R., and Head, Henry. 



1908. A human experiment in nerve division. Brain, Vol. 31, pp. 323-450. 

 Schwalbe, G. 



1882. Ueber die Kaliberverhaltnisse der Nervenfasern. Leipzig. 

 Sherrington, C. S. 



1894. On the anatomical constitution of nerves of skeletal muscles, with 

 remarks on recurrent fibers in the ventral spinal nerve roots. 

 The Journal of Physiology , Vol. 17, p. 211. 



