GROWTH OF THE CEREBRAL CORTEX 213 
TABLE 11—Continued 
connie VOLS Were DENSITY: Se tae 
jee L.FXW.DX T WAD SST: 
SERIES, LITTER AND aon: ea AGE Aiea rae Bare 
r t, loa - - 
etoee wore Nee cant Starved ad Starved Fe | Starved ard 
and |forthe} and | forthe} and _ | for the 
controls} same |controls| same |controls} same 
age age age 
days | grams | mm. | mm.3 
Series II 
F a, b sb 13— | 0.832) 218.7) 252.5) 260 206 | 550.4) 520.0 
e-l T. II} 25+ | 1.204) 307.9) 303.4) 178 180 | 548.7| 545.7 
Series III 
G a-g T. [| 11+ | 0.844) 213.2) 229.1) 248 225 | 520.4] 604.1 
h-j T. IT] 22— | 1.154) 302.2) 294.7) 189 186 | 570.3) 546.7 
Average Ay 11— | 0.758) 188.2} 218.0) 298 254 | 504.4) 496.0 
(Ser. I-III) T. II} 20— | 1.107) 289.0) 286.1; 192 190 | 552.8) 543.6 
Average (Ceol 8— | 0.700} 162.2) 166.2) 348 324 | 478.5) 462.3 
(Ser. I) C. II} 19— | 1.227) 299.7) 278.8] 187 195 | 559.5) 641.0 
By comparing the corrected values in the underfed with the 
standard values, the average diameters of the cell body and of 
the nucleus in the underfed brains are found to be generally 
smaller, on the average, by 9.8 per cent (cell body by 8.6 per cent 
and nucleus by 11.0 per cent) than the standard value. At the 
end of the following table 13 appears a summary of the compari- 
sons, arranged as in the earlier tables in this study. 
As seen in this summary, both the pyramids and the ganglion 
cells are much retarded in development in size of the cell body in 
the underfed brains weighing less than 1.0 gram or of ages 
under sixteen days, the average diameters of the cell body being 
11.5 per cent (in the pyramids 11.2 per cent and in the ganglion 
cells 11.8 per cent) smaller than the standard for the same age. 
But in the underfed brains weighing more than 1.0 gram, this 
arrest in size-development of nerve cells is no longer so notable, 
the average diameters of the cell body being smaller than the 
standard by only 5.7 per cent (in the pyramids by 8.3 per cent 
and in the ganglion cells by 3.1 per cent). The size of the 
