498 FinKjicldiil Pi<>ii< rlies of Cerfdiii Spraii-Fhiitls 



blh day. A few patches now siil)i)OW<leiv. !)Ut llie i)iil(l<\v on the whole still 

 checked. 



"//( 'lai/. The majority of the patehes now "powdery"' or subpowdeiy. 



Exper. 2. Solution (pule i/elloiv) contuining 1-68 % S.S. and 1 % soft 

 soap. 



l.il rial/. Mildew checked; all the patches showing nioie or le«s collajKed 

 mycelium. 



3rd day. All the patehes sterile. 



1th day. Most of the patches still sterile with collapsed mycelium; on each 

 leaf, however, a few patches showed scattered erect new coiiidiopliores. 



!()//( day. No further growth of the mildew, which was practically entirely 

 dormant and sterile. 



Exper. 3. Solution {ytllow) containing 1-68 % S.S. and 1 % soft soap. 

 (This was the same solution as used above in Exper. 1, 

 after one day's exposure to air in a half-filled 

 stoppered bottle.) 



2nd day. Mildew- much checked, with collapsed myceUum. 



3rrf day. Mildew mostly sterile, but here and there a few short conidiophores ; 

 slight "scorching" evident at the tip of two of the leaves. 



■itii day. All the patehes apparently becoming sterile; no further injury to the 

 leaves. 



6lh day. The mildew eviirywherc sterile. 



\Olh day. The mildew sterile and apparently dead on the old leaves; on (he 

 younger leaves several patches bearing fairly vigorous tuft.s of conidiophores. 



Hijdrogen Sulphide 



Exper. 1. Solution containing 0-056 % S.S. and 1 % soft soap. 



Zrd day. The mildew quite unaffected; all the patches "powdery." 

 5th day. All the patcluvs as "powdery'' a-s those on the control leaves — in 

 some cases more so; no injury to the leaf. 



Summarji of Ohsrnntions. W. 



It will bo seen fniin tlic fon>i.'oiiij; ('.\])i'riin('nts tiiat tlic .stiipluir 

 of livdroopn sulphide is without dotriiiieutal efl'ect upon the mildew, 

 although the coucoiitratiou at which this was used is such as to be 

 comparable oulv with (uir e.\])eriinents with the wealcei- cnuceutratious 

 of yellow ammouiuui sul]ihi<le. 



Aninioniuiu hydrosulphiilc tree from polysulpliides is seen to be 

 only slightly detrimental to the fun-jus and clearly is less efficacious 

 as a fungicide than ammonium sulj)hide, also free from polysulpliides, 

 at the same concentration of .sulphide-sulphur. .Vt double the con- 



