136 AGRICULTURAL EXPERIMENT STATION. 



very few of the larvae had been kihed. The mixture was actually 

 less active than the simple solution. 



Experiments zvith Sulphate of Copper and Lime, or Bordeaux 



Mixture. 



The solution used in these experiments was made by adding 

 one ounce of copper sulphate to one and seven-eighths pints of 

 water and to this sufficient milk of lime to make the mixture 

 alkaline. The amount of water in the experiment jars was 

 measured and thus the proportionate amount of Bordeaux mix- 

 ture was obtained, 



Bxperiment p; with larvae of Citlex pipiens breeding- in pails 

 at New Brunswick. They were placed with the breeding water 

 in two jars and enough of the mixture was added to give the 

 following : 



Jar 1 — I part of Bordeaux mixture in 82 of water. 

 Jar 2 — I '■ " " " " 24 " " 



Forty-two hours after the addition of the Bordeaux mixture 

 most of the larvae were dead in Jar i, nearly all were dead in 

 Jar 2 and what remained were inactive. After sixty-six hours 

 two larvae were yet alive in each jar and, after ninety hours, there 

 being no further change, the experiment ended. 



Bxperiment 10: with larvae and pupae of Cidex pipiens, breed- 

 ing in a lot puddle at New Brunswick. They were placed in four 

 jars of city water with some food material and some of the 

 breeding water ; enough Bordeaux mixture being then added to 

 give the following proportions : 



Jar I — I part of Bordeaux mixture in 1560 of water. 



Jar 2 — I " " " " " 780 " " 



Jar 3—1 " " » " " " 390 " 



Jar 4—1 " " " " " 19s " 



Twenty-four hours after the addition of the Bordeaux mixture 

 many larvae had pupated and many adults had emerged. There 

 were manj^ dead larvae in Jars i and 2, and most of the larvae 

 were dead in Jars 3 and 4. After forty-eight hours more larvae 

 had pupated and many more adults emerged. Several active 

 larvae were in Jars i and 2, but none were left in Jars 3 and 4. 

 After ninety-six hours many more adults had emerged ; there 

 were several larvae and pup?e in Jars i and 2, but nothing was 

 left in Jars 3 and 4. 



It is to be observed that in these experiments as in those with 

 the copper sulphate much development from larva into pupa and 



