SODIUM CARBONATE. Ill 



copper bouillies, but it has no other function than to decompose the 

 blue vitriol into carbonate of copper and sulphate of soda. An excess 

 of carbonate of soda must be avoided in the preparation of Burgundy 

 or cuprosodic bouillies, because these evaporating on the leaves may 

 give rise to the same bad effects as carbonate of soda and cause the 

 leaves to drop. Carbonate of soda has also been recommended 

 against plant lice, and chiefly against the woolly aphis, but Muhlberg 

 has shown its inefficacy. According to Delacroix one of the best 

 emulsions to use against lice is carbonate of soda 10 lb., soft soap 

 20 lb., petroleum 1 gallon, in 10 gallons water. 



Note hi) Translator, re. Arsenite of Soda, p. 108. — This substance is made a 

 speciality of by at least one firm in Great Britain who sell it in a more or less con- 

 centrated state of solution. Several "accidents" have occurred from the solution 

 having been drunk inadvertently, and some deaths occurred through leakage of a 

 cask on to sugar casks during transit. What is known in medicine as Fowler's 

 solution is a solution of arsenite of soda. 



