12 



G. C. Embody. 

 Table IV. Egg Counts. 



while the mean daily temperature of the water might be higher or 

 lower than that of the air, that in the course of a number of days the 

 average means in the two cases remained practically equal. Therefore 

 in the determinations which are to follow, use has been made of the 

 mean daily temperatures of the air as registered by the maximum- 

 minimum thermometer. Observations upon the progress of development 

 of the eggs in the brood pouches were made daily, at first and towards 

 the end of the incubation period, twice daily. 



As an experiment some of the eggs of a few females were taken 

 from the brood pouches and placed in watch glasses, each glass having 

 been suppUed with water and plants (Lemna and Elodea) from the 



