July, 1922] BONNS — • A STUDY OF CLAVICEPS PURPUREA 353 
Plate XX 
Growth on corn meal in Petri dish 
Fig. I. Top. 
Fig. 2. Bottom, showing diffusion of pigment through substrate. 
Plate XXI 
Fig. I. Kymogram record, showing contraction effect of standard fluid extract of 
ergot {A and C), and of extract from Claviceps cultures {B, D, and E), at different dilu- 
tions, on uterine muscle of guinea pig. Figures give height in millimeters of wave from 
base line to crest. Extract concentrations at crests. 
Fig. 2. Normal posture of White Leghorn cock. 
Figs. 3, 4, 5. Effect of Claviceps culture extract on posture of White Leghorn cock. 
