— 53 — 



It will be observed that some of the departures (in days) are plus (later) 

 and others are minus (earlier) than the computed average date. "In general, for 

 the whole country, the departures for spring and early summer events are plus the 

 constant for valleys and coasts, and minus for plains, plateaus and mountains ; 

 and the reverse for late summer and autumn events." (Figs.) 



It is, of course, impossible at present to indicate the extent which this Law- 

 can be used in furthering investigations of insect and fungous diseases. Hopkins 

 has shown that the Law has been of service in the control of the Hessian Fly and 

 certain forest insects, consequently it is quite natural to suppose that other insects 

 may also be controlled to better advantage by making use of this Law. It seems 

 to me that if ever the method of Natural Control, discussed in my previous ad- 

 dress, is to be employed on a wide scale, it must be based firmly on the Bioclima- 

 tic Law. 



An Isophanal Map of the United States with annexed Chart to show best dates for fall wheat seeding 



in different districts. 



Hopkins also suggests that the Law may be of service in the investigation 

 and control of fungous diseases. The appearance of the earliest spring stages of 

 many fungi, those largely concerned in the inoculation of plants, are dependent 

 on climatic factors which, as we have seen, influence the time of leafing and 

 flowering of plants. 



Our spraying calendars are now based on phenological phenomena : this fact 

 is but another evidence of the importance of relating farm and orchard operations 

 to the Bioclimatic Law. 



CAN WE IMPROVE POTATO STORAGE METHODS ? 

 P. I. Bryce, Macdonald College. 



The potato stands next only to wheat as the source of the vegetable food in 

 our diet. While the potato contains a high percentage of water, its flavor, its 



