712 



J. Marion Eead 



Table II. 

 Observed weights and weights corrected. 



In only two cases was the weight in column B corrected and 

 in both it was raised to approach an average for a week or two 

 preceding. It sometimes happens that the mother becomes upset 

 somewhat before birth and eats lightly, thus gaining but little or even 

 losing weight just before parturition. In most cases there is a steady 

 gain up to the time of birth so in the two which suffered a 

 loss it seemed reasonable to correct the weight. It must be under- 

 stood that in all cases in which the weight is corrected it has never 

 been raised or lowered to reach the average, but a weight has been 

 chosen between the observed and averaged weight. 



In the third column of Table II the increase of weight during 

 gestation is given. This is in every case greater than the total 

 weight of the litter. The difference between these two figures (found 



