392 Profs. Percy Frankland and Marshall Ward. 



from the detailed investigation of a single species and the measure- 

 ment of the growth of a single filament (watched continuously under 

 the microscope) under different conditions of exposure ; they have 

 been incidentally referred to in my lecture at the Royal Institution, 

 in May, 1894, and I shall hope to hring them before the Royal Society 

 shortly, They prove still more conclusively at least the main point, 

 that exposure to sunlight does materially affect the rate and manner 

 of growth, &c., of a bacterium rodlet or filament, as well as the 

 germinal power of the spores. 



As regards further details on the action of light on the spores and 

 bacilli, I may refer the Committee to my memoir, now in the hands 

 of the Royal Society, an abstract of which appeared in the ' Pro- 

 ceedings,' vol. 54, p. 472. 





