10 



TALKS AFIELD. 



Fig. 9. 



off carbonic acid gas and alcohol, which, in 

 their escape, puff up the dough, causing it 

 to " rise." A yeast plant magnified nearly 

 eight hundred times is shown in its differ- 

 ent stages at Fig. 8. 



The Moulds which grow on nearly all de- 

 caying substances have a greater 

 external semblance 

 to the common idea 

 of a plant than have 

 the yeast plants and 

 bacteria. Fig. 9 

 represents the bread 

 mould magnified, 

 the spores escaping from the 

 apex. Fig. 10 shows the cheese 

 m o u 1 d 



with the fruit borne 

 in a different man- 

 ner. 



Under the com- 

 mon denominations 

 of JRitst, Mildew^ 

 and Blight are in- 

 cluded many very 

 dissimilar kinds of 

 fun gi . They are 

 parasites, which commonly attack the leaves 



Fig. 10. 



Fig. 11. 



