Plant Diseases and Insect<i. 83 



parations. The following table shows the amount of each pre- 

 paration used : 



Bordeaux Mixture \ i k.* sulphate of copper Mo i hect.f of 



[Boicilhe bo7-delaise) . . ^ 2 k. slacked lime f water. 



Verdet ^ , ^ to i hect. of 



{^Dibasic acetate of copper') ( \ water. 



f I k. sulphate of copper . . ] 



Improved Bordeaux Mixture J 5 k. sugar (to i hect. of 



[Boui//ie bordelaise celeste) j 5 k. aluminium calcide . . . f water, 

 i I k. slacked lime I 



Bordeaux Mixture and spori- ( ' ^ ^f^'^^l^y °^ ^°PP^'- " | to i hect. of 



( r-i \ -Nik. slacked lime - 



vore (Glue) ) , . I water. 



^ ' ( I k. sponvore ) 



Mixture of carbonate of soda j i k. sulphate of copper. . ^ to i hect. of 



and sulphate of copper. { 2 k. crystals of soda .... f water. 



Gelatinous hydrocarbonate of ^ i ^^ ^ ^^^^ ^^ 



CO p p e r yhydrocarbonate -(1.5 k [- 



de ciiivre gelatineiix) ..,,,.( ) 



Aluminium mixture, without \ i. 73 k. chloride of calium \ to i hect. of 



copper I 3- 7 k- alum \ water. 



Check square, no application. 



''Mr. Duchein, who conducted the experiments, made three 

 applications to each square : 



The first application May 21, i8go. 



The second application June 2, i8go. 



The third application July 25, i8go. 



"The following powders were used upon the squares of the 

 second plat, one kind to each square : Shawinski's powder, 

 Shawinski's sulphur, cuprosteatite, sulfosteatite, sulfocyanide 

 of copper, sulphated verdet {soufre au verdet), hydrated sul- 

 phate of copper {soufre a V hydrate de cuivre), sulphated sulphur 

 {soufre sulfate), cupro-phosphate {cuivro-phosphate), sulphur 

 and cupro-phosphate {soufre au cuivro-phosphate). 



''These squares received four applications : 



The first application May 20, 1890. 



The second application ... June 2, 1890. 



The third application June 23, 1890. 



The fourth application July 25, i8go. 



" Since the mildew did not appear in the squares this year, 

 the relative merits of the substances used cannot be estimated, 

 except in regard to the length of time in which they remain 

 effective. 



* Kilogram or kilo, i k. = 2. 2 lbs. f Hectolitre, = 26. 4 gals. 



