156 ELIZABETH HOPKINS DUNN 
The comparison of mature males with mature females shows 
that, while the body weight of the females may be much less than 
that of the males of the same age, there is no marked difference 
in the size of the largest nerve fibers, so one may say in general 
that the largest nerve fibers in mature females are much larger in 
proportion to the body weight than are those of mature males 
of the same age, that is, the efferent pathway is greater in the 
female than in the adult male of the same age. 
LITERATURE CITED 
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glion ciliare. Arch. f. mikr. Anat., Bonn, Bd. 47, 8. 655-668. 
Bovuauton, THomas Harris 1906 The increase in the number and size of the 
medullated fibers in the oculomotor nerve of the white rat and of the 
cat at different ages. Jour. Comp. Neur., vol. 16, pp. 153-165. 
Duférh, CuHaRLtEs 1903 Sur l’extension de la myéline dans le névraxe chez des 
sujets de différentes tailles. Comptes rendus de la Société de biologie, 
t. 55, pp. 1158-1160. 
Donatpson, Henry H. 1908 A comparison of the albino rat with man in respect 
to the growth of the brain and the spinal cord. Jour. Comp. Neur., 
vol. 18, pp. 345-390. 
1911 President’s address. Journal of Nervous and Mental Disease, 
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Dona.pson, Henry H. and Hoxsr, G. W. 1905 On the areas of the axis cylinder 
and medullary sheath as seen in cross sections of the spinal nerves of 
the vertebrates. Jour. Comp. Neur., vol. 15, pp. 1-16. 
Dona.pson, H. H., Watson, J. B., and Dunn, E. H. 1906 A comparison of the 
white rat with man in respect to the growth of the entire body. Boas 
Memorial Volume, New York. 
Dunn, Exizaseta Hopkins 1900 The number and size of the nerve fibers inner- 
vating the skin and muscles of the thigh in the frog (Rana virescens 
brachycephala, Cope). Jour. Comp. Neur., vol. 10, 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 vires- 
cens brachycephala, Cope). Jour. Comp. Neur., vol. 13, pp. 297-328. 
