TABLE 3 
Giving for each individual and for each brain weight group the number of nerve 
cells in 0.001 mm.’ in volume of the cortex, in the lamina pyramidalis and in the 
lamina ganglionaris, and also the number of the ganglion cells in the lamina 
ganglionaris, all counted at the middle part of the cortex in the frontal section, as 
shown in figure 2. Albino rat 
eee oy NUMBER OF CELLS IN A VOLUME OF CORTEX, 0.001 mm.3 
GEour seen W.D ees Lam. pyramid. Lam. ganglion. Serene in 
in fresh enalide 
brain Ob- Cor- Ob-_ | Cor- Ob- Cor- 
served | rected served | rected served rected 
grams mm. mm. 
la | O2153 6.45 5.65 1150 775 
e | 0.154 6.35 5.40 1130 695 
lo |} Oa ie/7/ 6.95 6.26 945 690 
0.161 (GUAT ANE 1075 720 
IIa | 0.218 8.40 Goo 830 556 370 248 91 61 
le OE22l 7.95 6.50 930 509 393 215 114 62 
e | 0.261 7.80 7.10 735 554 322 242 104 78 
ol |) e771 Calo, 6.80 726 490 358 242 114 Wil 
e | 0.288 8.55 7.05 715 402 424 238 120 67 
(Birth) 0.251 (GUAL MD) 787 502 373 237 109 69 
IUO8 |) Ose 8.50 7.65 625 456 330 241 112 82 
b | 0.3822 8.70 6.80 730 348 415 198 122 58 
g | 0.374 8.95 8.40 504 417 270 223 98 82 
e | 0.3890 8.85 7.60 493 312 312 197 104 66 
1 | 0.395 9.10 8.60 401 337 262 220 90 76 
0.358 (GUL ISI) 561 374 318 216 105 ei 
IV b | 0.400 9.00 8.50 410 345 258 217 94 79 
a | 0.402 9.10 7.90 473 309 267 175 95 62 
e | 0.420 9.00 8.15 451 334 240 178 74 55 
1 | 0.443 9.15 8.40 424 327 22 176 ds 56 
d | 0.459 9.50 7.95 440 258 250 146 77 45 
e | 0.466 9.30 9.25 355 348 186 182 59 58 
0.482 (GAL MO)? 426 3820 238 Gy) 79 59 
ON a0 5019-80) | 9320) | "371 sr 199 165 69 57 
a 08529 9.65 9.10 362 303 183 154 67 56 
b | 0.528 9.90 8.60 365 240 205 134 al ol 
ec | 0.534 | 10.30 8.25 432 222 228 117 78 40 
d | 0.537 | 10.00 8.80 412 281 210 1438 al 48 
e | 0.555 9.90 9.00 368 277 164 123 62 47 
