/. ]yOODLAXl) HASTINGS AND VERNON C. BODE 295 



McLaughlin, and Droop (9). Details of these media as well as in- 

 formation concerning the growth of the organism will be published 

 subsequently. 



At densities of 10,000 to 20,000 cells per milliliter cells are har- 

 vested from the growth medium by filtration on a Biichner funnel, 

 washed tAvice with distilled water, and scraped into a container. 

 W^ater extracts may be made immediately or, alternatively, the cells 

 may be dried for futme use. There is little loss of activity in dried 

 cells. 



Fig. 1. Photograph of a flask of C.onyaulax polyedra cells, taken witii the light 

 emitted by the cells as they were stimulated. Exposure, about 5 seconds. 



