86 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



nursery 0*25 gramme cyanide per cubic foot space enclosed is used, while 

 in the orchard only 0-20 gramme per cubic foot is necessary. In estimating 

 the chemicals, follow the instructions given in the last article for the 

 fumigation of nursery stock, and heed cautions cited. 



The 'cyanide is usually weighed in the orchard by one man. This is 

 Important, as this deadly poison should not be handled by any person 

 other than the one familiar with it and who should be responsible for its 

 use. The sulphuric acid can be kept in a carboy, drawn in small 



