COMPLEX BRANDS. 



•71 



existence of tliese cells was to soak the spores in 

 muriatic acid ; then^ upon pressure of tlie glass covers 

 tlie outer membrane and ringed cells were rup- 

 turedj and tlie inner cell escaped (plate III. fig. 46). 



Germination may be induced in these spores by 

 keeping them in a moist atmosphere (fig. 45) ; but 

 the mode does not differ from fthat described above 

 as occurring in the " corn mildew .'' Mr. Currey 

 writes : — " I know no microscopical object of greater 

 beauty than a number of fruits of Phragmidvwm in 

 active germination." By Phragwddium he means 

 the Aregma of this work, of which Phragmidium is 

 a synonym e. 



Well may the reader remark on arriving thus 

 far, " Does all this examination and detail refer to 

 the fruit borne in the little blackish spots on bramble 

 leaves, which I have hitherto overlooked ?" Ay, 

 and to several similar spots on other plants. Exa- 

 mine carefully the raspberry leaves in your garden, 

 and you will probably find similar, but smaller, 

 pustules also on the under surface (plate III. fig. 42) . 

 We say probably, because none of our British species 

 seem to be equally uncommon with this. During 

 some years we examined hundreds of plants, and 

 did not find a single pustule. This species was 

 named by Dr. Greville Aregma gracilis, which name 

 it still continues to bear (fig. 43). Such a fate will 

 not await you if you should proceed in the autumn 

 to some chalky district where the burnet is common. 

 Go, for instance, to Greenhithe or Northfleet, on rho 



