60 



MICEOSCOnc APPEAHANCES. 



the paper recently alluded to. He placed a 

 specimen in the hands of Mr. Leonard, re- 

 questing him to observe and delineate what he 

 saw. The result was the group here shown, 

 in which the several stages suspected as exist- 

 ing may be seen. It looks certainly like a 



Various forms of the spores of the wheat mildew of 1 S45, 

 magnified 240 diameters. 



case of transition. All, however, that the 

 author can as yet venture to assert is, that 

 some puccinia have clearly the appearance of 

 uredo before the septum, or division of the 

 spores into chambers, is fully developed. In a 

 splendid figure by Corda, these various forms 

 are given with great effect as they burst the 

 epidermis ; and the drawing of that incom- 

 parable delineator of fungi confirms the opi- 

 nion that the last observation is the one that 

 is safe and accurate. Questions of this kind 

 will be view^ed at first sight as purely botanical, 

 though they certainly tend ultimately to the 



