THE PHYSIOLOGY OF REGENERATION 



339 



the dry substance and the water in the course of regeneration 

 the curves reveal a very striking agreement. 



Experiment C. This experiment was begun on July 13, when 

 50 of the worms just operated upon were weighed and dessicated. 

 The water content in this group, which served as control for the 

 experiment, was 74,61 per cent. The regenerating worms were 

 then examined at five-day intervals until August 2, and later at 

 ten-day intervals. The results of this experiment was shown in 

 table 3. 



TABLE 3 



Five days after the operation the water content in the regener- 

 ating worms was found to be 75.64 per cent; ten days after the 

 operation, 76.82 per cent; fifteen days after the operation, 76.80 

 per cent; and twenty days after the operation the water content 

 reached a maximum of 77.18 per cent. Ten days later still the 

 content of water had decreased to 76.41 per cent. The peculig^rity 

 of this experiment is that the maximum per cent of water was 

 reached somewhat later than was expected, and indeed later than 

 in any of the other four experiments. Since, however, the deter- 

 minations of the content of water were made only once every 

 five days, it is quite possible that the highest per cent of water 

 found in this experiment, viz., that observed on the twentieth 

 day, was not in reality the maximum attained during the regener- 

 ative process — as this may have occurred some days earlier, but 

 was already a step towards a decrease of the water content. The 



