June' 1896.] 



INJURIOUS INSECTS AND FUNGI. 



43 



first infected by the spores of this mould, but some rod-cells of 

 Micrococcus albidus, found mixed with the Fusisporium spores 

 penetrated them, first, and formed distinct colonies, and the 

 Fusisporium did not show itself until later on. 



The American experts, according to M. Eoze, profited 

 unawares in their experiments by the assistance of Micrococcus 

 pettucidus in helping on the first developments of the moulds 

 and bacteria, and in producing together the disease of potato 

 scab. 



It is discouraging to find from M. Roze's experiments that 

 the micrococcus which originates potato scab is preserved in the 

 ground, and presumably is able to infect potatoes planted within 

 its reach. 



