432 REPORT OF THE DEPARTMENT OF ENTOMOLOGY. 
quantity one should employ high-grade lime, practically free 
from magnesium compounds. By using lime testing at least 
90 per ct. calcium, and with thorough stirring and vigorous 
cooking we have been able to make concentrated solutions, 
which ranged in density from 25° to 33° Beaumé. There was 
practically no coarse sediment in any of the boilings; and 
usually all of the mixtures would pass through the ordinary 
strainer. It is not advisable to separate the clear liquid from 
the insoluble materials because of the time required by this 
operation and the loss of efficient liquids. 
