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U. S. DEPARTMENi^F AGRICULTURE. 



BUREAU OF PLANT INDUSTRY— BULLETIN No. 37. 



B. T. Galloway, CVkV/-'' ^'""i". 



FORMATION OF THE SPORES IN THE SPORANGIA OF RHIZOPUS 

 NIGRICANS AND OF PHYCOilYCES NITENS. 



iV 



DEANE B. SWINGLE, 

 Assistant in Pathology, Laboratory of Plant Pathology. 



VEGETABLE PHYSIOLOGICAL AND PATHOLOGICAL 

 INVESTIGATIONS. 



ISSCED Jl-NK 27, 190.3. 



WASHINGTON: 



government PRINTING OFFICE. 

 1903. 



