FORM OF THE SPORES. 35 



nified, they will be still more distinctly seen. 

 They are well represented in the figures we have 

 given, the round spore being one of uredOy or 

 rust, mixed with those oi puccinia. 



Each of the two compartments into which 

 these spores are divided is filled with sporules. 

 The spores themselves generally make their 

 appearance immediately beneath the stomata. 



Spores of puccinia separated from the straw and magnified 

 240 diameters. 



or pores, mth which the stem abounds. These 

 stomata^ it is well known, are the organs by 

 which plants exhale and inhale. Under the 

 influence of light, and in dry weather, the 

 stomata are in active exhalation ; but in wet 

 and gloomy seasons these functions are re- 

 versed, and they inhale powerfully. It is then 

 that, in all probability, the sporules are im- 

 bibed with the moisture, and find a suitable 



