Ixxv 



Mr. Smee had made a collection of not fewer than 360 micro- 

 scopical slides illustrating the disease on its first outbreak, and on 

 these being recently examined by Mr. W. G. Smith it was found that 

 n large number of the preparations of the potato Aphis exhibited 

 the Peronospora in different stages of growth, and a highly 

 magnified figure of the legs of an Aphis is given, showing the 

 spawn-threads running through the limb and bursting out in 

 parts developing the oogonia and the antheridia of the fungus. 

 In this manner, and not by the action of sucking or poisoning the 

 juices of the plant b}' the insertion of the rostrum of the healthy 

 Aphis, the disease may be said occasionally to result from the 

 presence of that insect. 



T. p. NEWMAN, PRINTER, 32, BOTOLPH LANE, EASTCHEAP, K.C. 



