30 SUBJECTS OF THIS VOLUME. 



by these parasitic pests, wliicli are quite dis- 

 tinct from each other, having nothing in com- 

 mon, except that they germinate within the 

 tissues. When the habits of these fungi have 

 been fully described, the reader will be prepared 

 for any concluding observations space may allow 

 at the end of this work. At present, sufficient 

 has been said to open the way to a clear com- 

 prehension of the statements about to be made. 



With regard to the insects which will come 

 under review, no prehminary description is re- 

 quired, as the story of their encroachments in- 

 cludes that of their natural peculiarities, and 

 we have only to deal with such as produce 

 blight in the wheat, and may be called true 

 parasites, produced in, and living upon, certain 

 portions of the plant. 



The order in which the fungi will be treated 

 is the following : - 



1 . Those attacking the straw, 



2. Those attacking the leaves and chaf^. 



3. Those attacking the flower, 



4. Those attacking the gram. 



After these fungi have been traced in their 

 growth and effects, a description will fee given 

 of certain extraordinary animalcule called FV- 

 hriones Triticif or eels of the wheat, which ren- 



