FUNGICIDES 



31 



The Soda Bordeaux 



Copper sulphate (bluestone) 5 pounds 



Commercial caustic soda sufficient to combine with the copper 



sulphate and leave a slight excess of soda. 

 Water 50 gallons 



It will be noted that the amount of caustic soda to be 

 used is not stated definitelj'. It is impossible to make a 

 definite statement, since the strength of the various com- 

 mercial sodas varies greatly. 



The following table gives the amount of copper sulphate 

 required for a single can of several of the more common 

 sodas. In the last column is found the amount of mixture 

 which a can will make. For example, if the Champion 

 soda, a can of which weighs 13.75 ounces, is used, one should 

 use 1.6 pounds of copper sulphate to each can of soda. 



