252, CAROLINE M. HOLT 
GREENMAN, M. J. 1913 Studies on the regeneration of the peroneal nerve of 
the albino rat: number and sectional areas of fibers: area relation 
of axis to sheath. Jour. Comp. Neur., vol. 23, no. 5, pp. 479-513. 
Harpesty, 1. 1899 The number and arrangement of the fibers forming the 
spinal nerves of the frog (Rana virescens). Jour. Comp. Neur., vol. 
Ono dep: 104. 
Harar, 8. 1902 Number and size of the spinal ganglion cells and dorsal root 
fibers in the white rat at different ages. Jour. Comp. Neur., vol. 12, 
pp. 107-124. 
1903. On the increase in the number of medullated nerve fibers in 
the ventra’ roots of the spinal nerves of the growing white rat. Jour. 
Comp. Neur., vol. 13, pp. 177-183. 
Hout, C. M. 1917 Studies on the olfactory bulbs of the albino rat. I. Experi- 
ments to determine the effect of a defective diet and of exercise upon 
the weight of the olfactory bulbs. Jour. Comp. Neur., vol. 17, pp. 201- 
234. 
Kine, H. D. 1910 The effects of various fixatives on the brain of the albino 
rat, with an account of a method of preparing this material for a 
study of the cells in the cortex. Anat. Rec., vol. 4, pp. 214-244. 
Ranson, 8S. W. 1906 Retrograde degeneration in the spinal nerves. Jour. 
Comp. Neur., vol. 16, pp. 3-31. 
ABBREVIATIONS 
s, areas in figures 1 and 2 enlarged in mi, mitral layer 
figures 3 and 4. g, granular layer 
fi, outer fiber layer f, inner fiber layer 
gl, glomeruli c, cerebrum 
mo, molecular layer 
PLATE 1 
EXPLANATION OF FIGURES 
Median longitudinal section through olfactory bulb of Fy, section 3 1/6. 
F;, underfed 31 days. Fina! brain weight, 1.5470 grams, bulb weight, 0.0203 gram. 
Defective diet. Magnified 24 diameters. 
Median longitudinal seetion through olfactory bulb of F;, section 5 5/4. Fs, 
control for Fy. Brain weight, 1.6984 grams, bulb weight, 0.0315 gram. Magni- 
fied 24 diameters. 
