1911] The Ottawa Naturalist. 137 



discussed the effect of a fungus on the host plant and hinted at 

 certain factors rendering plants more or less susceptible to disease. 

 From the practical standpoint of the control of disease in 

 our crops a knowledge of these different aspects of the subject 

 is necessary in order that the organism causing the disease may 

 be attacked where it is most vulnerable. We see that in spite 

 of certain general principles the methods to be adopted against 

 different diseases will vary with the life-history of the causal 

 organism and hence has arisen the necessity for close investiga- 

 tion of these life-histories and the finding of methods of treatment 

 based upon them which together form so large a portion of the 

 work of the Plant Pathologist. 



THE ENTOMOLOGICAL SOCIETY OF ONTARIO. 



The Forty-eighth Annual Meeting of the Entomological 

 Societv of Ontario was held at the Ontario Agricultural College, 

 Guelph, on November 23rd and 24th. The reports of Directors 

 Gibson, Grant, Cosens and Treherne on the destructive insects 

 of the vear in their respective districts showed that many of the 

 well known pests had been present in large numbers and that 

 consequently much damage to various kinds of crops had re- 

 sulted from their attacks. Such insect pests as the Codling Moth, 

 Apple Maggot, San Jose Scale, Plum Curculio, Oyster Shell Scale, 

 Cutworms, Root Maggots, etc., were reported upon by the above 

 Directors, and by Dr. C. Gordon Hewitt and Mr. L. Caesar, of the 

 O.A.C., during the afternoon of the first day's session. An interest- 

 ing account of "The Work of the Division of Entomology" of 

 Ottawa was given by Dr. Hewitt, in which statements w T ere 

 made of the several branches of the work which is now carried 

 on under his direction. During the same afternoon a paper by 

 Rev. Dr. T. W. Fyles, of Hull, Que., on "Notes of the Season of 

 1911" was presented, in which observations were recorded which 

 had been made by this veteran entomologist during the past 

 summer. 



At the evening meeting, held in Massey Hall, a happy 

 address of welcome was presented to the members by President 

 Creelman. Dr. William Riley, of Cornell University, w r ho was 

 to have delivered the Popular Lecture, unfortunately was too 

 ill to be present, but his place was taken by Dr. Hewitt, who 

 gave a most interesting address on " Insect Scourges of Mankind." 

 The two dreaded diseases which are rampant in sections of Africa, 

 viz. : Nagana, which is destructive to domestic cattle and horses, 

 and the Sleeping Sickness, which depopulates many districts, both 



