194 Journal of Comparative Neurology. 



/, e., 38.3. grams, we find that from Series III and Series IV, 

 Group II, in each series, we might have anticipated here an 

 average gain of 16.9 to 20.5%, instead of which we find 

 only 6.g%. 



It appears that when the absorbing frog has been made to 

 take up the maximum amount of water as in Series II, III and 

 IV, the increase in weight of cord is large — whereas when the 

 frog has been dried for twenty-four hours previous to death, 

 losing thereby about 12% of its body weight mainly in the form 

 of water, the increase in the weight of the cord is small, 6.9%, 

 the records for the extreme cases being reduced in correspondence 

 with the averages. This indicates that the absorbing cord gets 

 its fluid from the surrounding tissues. 



We turn next to consider the rate at which the increase in 

 weight takes place. All the observations thus far recorded are 

 for the increase occurring during the single period of twenty- 

 four hours. It is proposed now to present our determinations 

 of the increase in the weight of the absorbing cord for i, 2, 3, 

 4, 5, 6, 12, 18 and 24 hours, using a constant method of prep- 

 aration so as to make the results comparable. As will be seen 

 by looking at the accompanying table (VII), the increase is not 

 perfectly regular, but the deviations from regularity are not 

 large enough to suggest more than the variability to be 

 expected in a small series of records. The general conditions 

 under which the observations in Series VII were made were, 

 those observed in Series II. 



Series VII. To show the influence of the length of time 

 elapsing between death and examination on the weight of the 

 absorbing cord: 



