136 



PROTESTS AND DISEASE 



Fig. 37, based on the drawings and description of Mr. A. E. 

 Hilton, who kindly gave consent. The specimen was 

 found in the Highgate woods ; six weeks of wet weather 

 had preceded its appearance. The plasmodium had grown 

 in a tree-stump and on emerging it had crept upon the 

 surface of a flat fungus and had assumed the cushion-shape 



FIG. 37. STAGES IN SPORANGE-FORMATION IN A SPECIES OF STEMONITIS. 

 The time between a and d was 20 hours, a to d. after A. E. Hilton ; 

 e and/, from the same author's description. 



shown at a. Smooth at first, its surface soon became sub- 

 divided into dome-shaped segments ; the mass then in- 

 creased in height and shrinking at its base, leaving traces, 

 called the hypothallus, on the substratum. As the changes 

 in form proceeded the colour changed from white through 

 deepening shades of brown to black, then to brown again 



