PEEFACE. 



THE following notes on the Diseases of Field and 

 Garden Crops are reports of a series of addresses 

 given at the request of the officers of the Institute of 

 Agriculture at the British Museum, South Kensington. 



The addresses were preceded by a course of twenty 

 lectures upon Vegetable Physiology in relation to 

 Farm Crops, by Professor G. T. Bettany, M.A., B.Sc., 

 F.L.S.; so that it was unnecessary, in speaking of 

 plant diseases, to revert in detail to the structural 

 and physiological branches, which had been covered 

 by Professor Bettany. 



The nature, limits, and objects of the addresses 

 will be seen in the introductory remarks. In the 

 lecture room actual examples of all the diseases in 

 different stages of growth were exhibited, and the sub- 

 jects were illustrated with camera-lucida drawings, as 

 well as larger coloured drawings made from living 

 examples. In the lecture room the simpler subjects 

 were taken first, the students being gradually led on 

 to the more involved ones. This arrangement has 

 been adhered to in the present work, where the 

 addresses have been put into book form, and numer- 

 ous additions made. 



