July 20. 1876.) JOURNAL OF HORTICULTURE AND COTTAGE GARDENER. 



53 



cells or bladders are shown at the base of the hair at e, the 

 cells of the skin of the leaf at c ; the latter have an irregular 

 outline, and fit one into the other after the manner of the 



bones of the skull. At d d may be seen two slits in the skin ; 

 these slits are the openings by which the plant breathes. The 

 moisture within the plant pours out through these slits in the 



Fig. 6.-THE bestinq spoees of the potaio disease fungus (Peronospora iniestanB) enlarges 400 diameters 



top of another. The Potato fungus oommonly tamo efl by 



its spawn the interior of the leaf ; as a rule it pushes seU 

 between the bladdery interior cells, and emerges to the light 



form of vapour, and there are a hundred thousand or more of 

 them to every leaf. The tall body at e e e is one of the hairs 

 of a leaf built up of three cells, like one chimney pot on the 



