COXTKXTS, 



Page. 



Historical 9 



Methocls 14 



Rhizopus nigricans Elirbg 15 



Phyromj/ref^ ntlerh'; Kiiii/e 23 



General eoiiHiderationp 28 



Summary 36 



Index to literature 38 



Description (jf plates 39 



7 



