482 Fiiii(/irl(/((I I'rojK rtics of Ccrtiiin Spidji I'liiuU 



sill day. The iiiildc^w alivo on the majority of the patclios and forniuig small 

 groups of eonidiophorcs or scattered single conidiophores. The kaf-cells at the 

 periphery of each patcli brown and dead; microscopical examination showed that 

 the epidermal cells alone at these places were kiDed. 



Exper. 2. Solution containing 0-5 % caustic soda and 1 % soft soap. 



1st day. The patches all nuuli cheeked, with the epidermal leaf-cells at the peri- 

 phery of each patch darkciicd. The (ip of one leaf, where the fluid had collected, 

 shrivelled. 



3ril day. The mildew greatly checked; some patches bearing a few isolated 

 conidiophores towards the centre. 



7(7i day. Most of the patches now showing a vigorous growth of conidiophores — 

 some patches almost powdery. 



I'Mh day. Most of the patches c(uite powdery. 



Exper. 3. Solution containing 0-5 % caustic soda and 1 % soft soup. 



Srd day. Jlildcw checked; some patches showing a few conidiophores. The 

 older leaves slightly "scorched " at the tip ; the youngest leaves severely "scorched " 

 at the edge and tip; growing tip of shoot not injured. 



()//( day. Mildew greatly checked ; most of the patches dead : the others showing 

 short, weak conidiophores. \o further injury produced. 



9th day. The patches of mildew now showing vigorous, erect conidiophores; 

 some of the patches "powdery." 



Exper. 4. Solution containing 0-75 % catisiic soda and 1 % soft soup. 



Srd day. Mildew dead or very greatly checked. All the leaves severely "scorched," 

 the injury being in the form of dead patches of cells chiefly at the tip and edges 

 of the leaf, but occasionally elsewhere; the growing tip of shoot not mjured. (The 

 "scorching" of the youngest leaves was sufficiently serious to prevent them sub- 

 sequently from develoj)ing normally.) 



6//i /lay. All the patches nearly but not ((uite dead — only a few weak conidio- 

 phores present. 



\)lh day. All the patches dead. 



Exper. 5. Solution containing 1 % caustic soda and 1 % soft soap. 



1st day. The mildew greatly checked ; the epidermal cells at the periphery of 

 each patch darkened. The tip of one leaf slightly shrivelled. 



3rd day. Most of the patches dormant, and some dj'ing or dead ; a few with bases 

 of young conidiophores. No fm-ther hijury, which was very slight. 



Illi day. No further growth of the mildew. 



dtli day. A few of the patches with small clustere of conidiophores. 



13//( day. A few patches showing small but vigorous tuffs of conidiophores; 

 the majority dead or nearly so. 



Exper. 6. Solution containing 1 % caustic soda and 1 % soft soap. 



\>it day. Mildew greatly checked: the leaf-cells undertying llie patches (urncd 

 brownish-black, the injury extending in most cases to the under-surface. 



