SUBJECTS OF THIS VOLUME. 31 



der the grain abortive. Then will be intro- 

 duced a review of that remarkable change in 

 the grain itself which has been designated^r^o^, 

 from the peculiar form it assumes, and which 

 is a subject deserving far more attention than 

 hitherto haa been given to it. Parasitic flies 

 which devastate the wheat-crops will form the 

 next subjects of inquiry, to which will be added 

 a series of observations, on matters connected 

 with the principal topics embodied in these 

 pages, made vdth a view to excite more inquiry 

 into these and kindred subjects of deep interest 

 both to the philosopher and the practical agri- 

 culturist. 



