Zee NAOKI SUGITA 
TABLE 15 
Giving for each brain-weight group of the normal albino rat the average initial 
brain-weight in the fresh condition and the brain weight after dehydration and 
extraction in 80 per cent alcohol (for twenty-four hours) and 90 per cent (for twenty- 
four hours) by a uniform procedure. The ratio of the final brain weight to the 
initial weight is given in the last column as a percentage value. Based on observa- 
tions on 120 albino rats, sexes combined. 
| BRAIN WEIGHT 
pl a aaa | NUMBER OF CASES aspen a es DEHYDRATION IN ANIMAL 
PER CENT ALCOHOL 
grams grams per cent 
II (birth) 6 0.271 0.213 78.6 
Itt 8 0.343 0.267 77.8 
IV 9) 0.428 0.332 77.5 
V 14 0.543 0.416 76.7 
VI 5 0.636 0.479 75.4 
VII 4 0.755 0.571 75.7 
VIII 10 0.844 0.630 74.7 
IX (10 days) 5 0.954 - 0.714 74.8 
x 6 1.047 0.757 72.3 
XI (20 days) 5 pelo 0.820 70.6 
XII 5 1.245 0.874 70.2 
XIII 8 1.341 0.921 68.6 
XIV 5 1.449 0.989 68.2 
XV a 1.558 1.074 68.9 
XVI 8 1.667 1.131 67.9 
XVII 6 1.721 1.170 68.0 
XVIII (90 days) 5 1.832 1.222 66.7 
XIX 1 1.924 Leoili(eauy 68.4 
XX 3 2.037 1.369 67.2 
because the extraction was not complete. My figures are only 
by-products in a study on histological technique, and to obtain 
the total quantity of the extractives the brain must have stayed 
much longer in alcohol of a higher concentration. My data 
therefore give merely the relative values for the quantity of the 
alcohol-extractives, but are comparable among themselves and 
with the values from the underfed brains treated in the same 
manner. 
In giving the ratio of the brain weight after extraction in aleohol 
(by this method) to its initial weight, no correction was made for 
the weight of water replaced by alcohol, because my object was 
