■■ _ 50 — 



Even for such men as college professors and men who have done considerable 

 spraying, I admit this for myself at least, it is quite a problem to decide where 

 we will buy our insecticides and fungicides, what we will use so as to get the 

 fullest possible benefit from and at the same time not pay too much for what we 

 buy. I do not know if you have ever gone into the trouble of getting different 

 quotations from the most reliable dealers of spraying materials. I have and it is 

 surprising to find the difference which can exist in such prices. Here are a few 

 exemples. (Read these on the original quotation slips). 



Another point is this. Some of our farmers and fruit-growers are still using 

 expensive material when we know, as a Society, that there is no use for such. 

 I have not bought a pound of Paris Green for our orchard for 10 years. I am of 

 the opinion that Paris Green should not be recommended, or even spoken of any 

 more, in connection with the spraying of Potatoes, when we can have such 

 an economical insecticide as arsenate of calcium which is safe with potatoes with 

 or without Bordeaux, if we add 5 pounds of Hydrated Lime to 40 gallons of 

 water. Paris Green just costs double the price of Arsenate of calcium in powder 

 form. We have even dusted successfully acres of potatoes with a preparation of 

 10% Arsenate of calcium and 907r Plydrated Lime when bugs were too 

 abundant, and with great success, without the least burning of the leaves. 



AN IMPORTANT BIOCLIMATIC LAW 

 W. Lochhead, Macdonald College. 



At the Annual Meeting of the Entomological Society of Ontario, held in Ot- 

 tawa in November last, I presented a paper on "Hopkins' Bioclimatic Law" with 

 the object of showing the value of this Law in the investigation of certain biolog- 

 ical problems such as the distribution of the fauna and flora and the control of 

 certain injurious insects. 



The term "Hopkins' Bioclimatic Law" is not strictly correct for the Law 

 was not discovered by Dr. Hopkins as he himself distinctly states in his mono- 

 graph, Supplement g of the Monthly Weather Rez'iew. But he amplified the Law 

 and applied it to this continent. By means of maps and charts he made it clear 

 that it was possible by utilizing the information thus obtained to secure greater 

 production of crojis. In the matter of wheat production, for example, he was able 

 to tell the farmers the best date to sow their wheat so as to escape the Hessian 

 Fly and to get maximum production. 



My object in bringing this Bioclimatic Law to your attention is to get your 

 co-operation in the matter of the collection of phenological records for Quebec. 

 Before charts can be made and the full details of the Law can be applied to this 

 province, as Hopkins has done for many of the States, many thousands of reliable 

 records covering a series of years must, be secured from all parts of the province. 



