192 Journal of Comparative Neurology. 



TABLE IV. 



Body Weight in grams. Percentage Gain in Absorbing Cord. 

 Extremes. Average. Average. Extremes. 



When we consider that Groups I and II in Series IV give 

 a high percentage apparently because the cases of least absorb- 

 tion are still high as compared with Series III, and that Group 

 III gives even a lower percentage in Series IV, than in Series 

 III, despite the fact that the average body weight in the former 

 is 57-3 grms. as against 49.8 grms. in the latter, it would 

 appear unwise to attribute any of the differences observed to 

 the influence of the lower temperature in Series IV. 



We conclude from the foregoing four Series, that we can 

 obtain concordant and nearly maximum results if we use 

 "saturated" frogs of the same body weight — unopened during 

 the period of absorbtion and kept at the temperature of the 

 tap water. 



We next sought to determine the effect of extracting 

 water from the entire animal before testing the absorption of 

 the cord. 



The observations are given under Series V. In this case 

 both frogs of each pair were put in a perfectly dry dish and 

 there kept for twenty-four hours before they were killed. The 

 dish was covered with a fine sieve and the temperature was that 

 of the laboratory. At the end of twenty-four hours they were 

 weighed a second time to determine the amount of loss of 

 water. The four pairs had been set aside, one pair in each 

 dish, and it is perhaps worth noting that for the two frogs of 

 each pair the proportional loss was closely similar while the 

 whole series of pairs gives a wide variation. 



Series V — Preliminary table to show the relative loss of 

 weight in each of the four pairs of frogs after remaining in a 

 dry dish at the temperature of the laboratory for twenty- 

 four hours. 



