lepidopterous larvce and pupcs. 



17B 



The pupa being weighed at regular intervals, the great 

 loss of weight at first and its rapid decrease afterwards 

 is well brought out. But there is no doubt that the 

 most rapid loss is not here recorded, as will be shown by 

 a comparison with subsequent figures. Such a loss took 

 place by evaporation from the moist surface while the 

 skin was being thrown ofi". The falling off in the loss of 

 weight is well seen by comparing the weighings of a 

 series of periods of 12 hours each : — 



First period of 12 hours, from 9.25 a.m., Aug. 25th, to 9.25 p.m., 

 Aug. 25th, a loss of 14 milhgi-ams. 



Second period of 12 hours, from 9.25 p.m., Aug. 25th, to 9.25 a.m., 

 Aug. 26th, a loss of 5 milligrams. 



Third period of 12 hours, from 9.25 a.m., Aug. 26th, to 9.25 p.m., 

 Aug. 26th, a loss of 5 milligi-ams. 



Fourth period of 12 hours (about), from 9.25 p.m., Aug. 26th, to 

 9.43 a.m., Aug. 27th, a loss of 3 milHgrams. 



* A damp clay. 



f A very damp day. 



