17 



"subtle as smoke." Tke experiments made by Fee and Ba- 

 "uer in regard "to minute parasitic fungi" I maintain ap- 

 "ply to Leaf Disease "having collected some leaves of a 

 "Rosa Centifolia which were entirely covered with Uredo 

 "rubigo, he took three Rose trees of the same species, the 

 "leaves of which showed no trace of Uredo and having put 

 "them in separate boxes, removed them from the neighbour- 

 hood of the affected plant but still kept them in a similar 

 "aspect. One part of the Rose leaves covered with the Ure- 

 lf do was mixed towards the end of the winter with the mould 

 "in the box of one of the Rose trees, and the remainder 

 "subsequently used in the manner immediately to be detail- 

 "ed. When the second Rose tree was in full vigour and near 

 "blossoming, some of the affected leaves were frequently 

 < f shaken over the soil to detach the seminules of the fungi, 

 "the remaining portion of which remained attached to the 

 "leaves. The branded Rose leaves were then steeped in 

 "water and the third rose tree watered with the mixture 

 "during the whole of the spring. The three insulated plants 

 'exhibited nothing particular until the autumn : then the 

 "rose tree in whose soil the brand-bearing leaves had been 

 "mixed, became profusely covered with the Uredo, the other 

 "two still remaining free : but the succeeding season the 

 "whole three trees were branded with myriads of Uridines. 

 "The above according to Fee prove "That the seminules of 

 "the fungi are absorbed along with fluid nourishment by the 

 "radical fibres, that those which are mixed with the soil and 

 <r become applied to the roots before the opening of the buds 

 "are more readily absorbed and developed, than after the 

 "leaves and flowers have been formed and that the period 

 "in which the fungi burst is often the period of maturition, so 

 "that the wind carries them in clouds from place to place 

 "and the rain precipitates them to the ground. The vici- 

 "dity of these spores when wetted serves to fix them to the 

 "root." What should the Planter learn from this? I main- 



c 



