386 Mr. H. Ling Roth's observations on Carausius. 



were fed on ivy leaves. Their food consumption doubled 

 after every ecdysis. Except when hatched out the nymphs 

 did not care for water, and only towards the end of life, 

 when they were unable to eat, did they drink with avidity'. 



The average duration of life was 136 days for the First 

 or Preparatory Period (i. e. from hatching out to the 

 6th moult), and 225 days for the Second or Reproductive 

 Period ; in other words, the insect spends two-fifths of its 

 life in preparing for the following three-fifths. 



The results here detailed demonstrate very clearly that 

 parthenogenetically produced organisms do vary consider- 

 ably, and support the observations made by Warren rather 

 than those of Weismann. 



