THE MONTHLY BULLETIN. 



747 



sium sulphocarbonate, calcium carbide, and formaldehyde. The 

 results obtained can be pronounced a complete success in no instance, 

 carbon bisulphide seeming to possess the greater possil^ilities. In the 

 cases of the other chemicals, owing to the indifferent success and the 

 great expense occasioned in applying these, their consideration is out 

 of the question for general use. 



Carbon Bisulphide. — The use of this agent should never be attempted 

 without first experimenting with one or two trees, to ascertain the 

 effect, as the chemical is very powerful and is capable of inflicting 

 serious injury. It should only be applied at a time when the trees 



Fig. 396. — Fibrous roots of orange in which many 

 nematodes were found living ; note the absence of 

 swellings. The orange eelworm, Tylenchulus senii- 

 penetransis, much resembles //. radicicola. (Original.) 



are dormant, the roots being less susceptible at this time. The best 

 method of procedure is to make holes in the ground to a depth of 10 

 to 15 inches ; the liquid should be poured in and the holes immediately 

 covered to prevent the escape of the gas, as the chemical is decidedly 

 volatile. It should be remembered at all times that the gas is both 

 poisonous and explosive, and only the greatest of care should be 

 exercised in handling. Eight or nine holes to the square yard should 

 be made and into each a teaspoonful of the liquid should be placed. 

 Following these directions the amount used per square yard will total 

 about 4 ounces, a dosage thai has been found to be very satisfactory. 



3 MB 



