ROBBERY AND MURDER. 



255 



etc.; whilst others, as 

 the GraminacecE, Eri- 

 cacece^ MalvacecE, Criici- 

 fercBy etc., are exempt. 

 There are, nevertheless, 

 very few orders of 

 phanerogamous plants 

 in which some one or 

 more species, belong- 

 ing to this section of 

 ConiomyceteSy may not 

 be found ; and the same 

 foster -plant will occa- 

 sionally nurture several 

 forms. Recent inves- 

 tigations tend to con- 

 firm the distinct specific 

 characters of the species 

 found on different 

 plants, and to prove 

 that the parasite of one 

 host will not vegetate 

 upon another however 

 closely allied." 



Dr. Cooke very gen- 

 erously and euphoni- 

 ously speaks of the 

 particular kinds of 

 plants whose life -histories he has studied with so 



Fig. 90. — d, two uredo spores of the Puccinia 

 graminis germinating upon the cuticle of 

 a wheat leaf ; the germ-tube of the lower 

 spore has just entered a stomatum ; in 

 the upper spore the process is more ad- 

 vanced. 



