interesting and instructive as bo; 

 Tadpoles pass through a hen 

 according to other authors, with 

 phase external influences and es 

 as regards sex, though hermapln 

 adult life. When tadpoles wer 



feeding with beef. Young raised t 

 57 to 78: in the second with fis 



of the female, are surely very suggestive. 



Median's observation that old branches of conifers 



escence; and th.»so of 'various botanists that prothallia of 

 grown in unfavorable conditions produce only antheridh 

 no archegonia or female organs are further illustrations o 

 same law and its bearing on the determination of sex. 

 (To be continued.) 



