578 
GENETICS: MACDOWELL AND VICARI 
The weights given for the first point (30 days) are mainly approxima- 
tions, as the first weighings of many of the rats were not taken till 
after this time. For this reason the weights at 40 days have been given. 
It will be noted that the averages of both sets of rats for 90 days are a 
little low. This lowering is unquestionably the result of a reduced 
diet that was given to all the rats in connection with a series of behavior 
experiments. 
The divergence shown between the two curves is sufficiently clear 
to make it impossible to question the conclusion that the alcoholics 
FIG. 1 
have suffered a loss in weight as a result of the treatment with alcohol. 
The amount of this loss as shown in the curves is very close to 20% 
of the normal weight at 182 days. The hght line in the figure was 
plotted from the averages given by H. H. Donaldson, The Rat, 
(Philadelphia, 1915), page 113, table 67. As all the rats here described 
were bred from the Wistar standard stock, the higher averages of these 
normals appear to indicate that the food and environmental conditions 
have been especially favorable. It follows from this that the lowering 
of the weights of the alcoholic rats is not partly due to unfavorable 
conditions. 
