MATERIALS 29 



Bordeaux Emulsion. 



{gb) Copper sulphate . . . 10 ozs. 



Lime-water . . . . SJ galls. 



Water to make up to nearly . 10 galls. 



Paraffin (solar distillate) . 22^ ozs. 



The amount of paraffin may be varied from 16 to 24 

 ozs., but with 22J ozs., as above given, the quantity 

 is just sufficient (if it is the solar distillate recom- 

 mended on p. 43) to buoy the copper sulphate up, 

 so that it neither sinks nor rises in the liquid, thus 

 obviating all need for keeping the liquid agitated 

 during use. Bordeaux emulsion of ten times the 

 above strength is sold by some manufacturers, and 

 only requires diluting to be ready for use. It should, 

 however, always be re-churned, either before or after 

 dilution, in case it has not been properly emulsified. 

 A few cases where foliage has been seriously scorched 

 owing to the omission of this precaution, have been 

 reported. Mere shaking of the emulsion is not 

 sufficient. 



For making Bordeaux mixture in the ordinary 

 way, the following formula may be taken — 



{gc) Copper sulphate . . i lb. 10 ozs. 



Lime . . . . .Mb. 

 Water to make up to . 10 galls. 



The copper sulphate is dissolved in nearly the whole 

 of the water, and the lime, previously slaked and 

 made into a milk (see p. 36), is run into it through a 

 piece of sacking, or through the strainer belonging to 

 the spraying machine. The lime should be added 



