—179— 



Carolina) leaf.) On good chemical authority it is placed as high 

 .1436 per cent or 7 grains of hydrocyanic acid in 100 gr. of bark, or 

 drops of acid. The bark fluctuates some in strength, in the Season 

 I think Rev. J. C. Wood, (in Insects at Home), overrates the laurel be 

 tie, in stating the largest and fiercest beetle laid, quivering in onesecom 

 In treating of B 'laps sulcata he shows the ineffectiveness of it, and advi 

 hot water. A beetle does not "take off in a second, in the stronge 

 cyanide. A large Pterostichus of the Peryphus section requires 2) 

 minutes! Chauliognalhus americanus % in., Pterostichus stygicus 

 minutes ! Megilla maculala 1 minute; Chrysochus auratus 4 minute 

 Anomoglossus emarginatus 1 \ minutes; Pieris rapae 2 minure; Hou: 

 fly 25 seconds; Strachio histrionica \ minute. These are given as fe 

 examples of comparison. Very often the bark seems to overcome to tl 

 last quiver of trophi and tarsi as quick as cyanide; but usually it tak 

 double the time: thus with a larger locust Calop/enus femur-rubrun 

 Cyanide took 2 5 minutes, and bark 5 minutes. This bark may mei 

 trial as a practical insecticide for garden and farm. It is useless to kill fli< 



caught in traps. It is here presented as preferable to Cyanide, for speci 

 uses. Cyanide potassa, or its acid, is the swiftest of all poisons, operati 1 



against vegetable, as well as all animated life, except the equine quadi 



peds perhaps. 



The Secretary called attention to the number of "Gordius" he ha 



observed yesterday at the waters edge at the Falconwood Club ground 

 Prof. Forbes stated that e similar hairworm, JlLrmis, had undoub 



edly lessened the numbers of grasshoppers in Illinois. 



Mr. Ph. Fischer of Buffalo, exhibited a fresh specimen of Catoca* 



obscura he had just taken, and observed it was the first record of its ca] 



ture at Buffalo. 



The President called attention to the unusual number of aphides i 



the State of New York, the present season, which had been more abui 



dant than ever before observed by him; he had observed them on tl 



Apple, black currant, tomato and potato, the latter more especially i 



the Eastern States; he had not hitherto noticed them on the tomato 1 



potato. The Hop crop was almost a complete failure in New Y01 



State from the attacks of these peste. 



Rev. C. J. S. Bethune, reported their prevalence in great numbe 



on the North Shore of Lake Ontario. 



Prof. Forbes stated that his section of country was rather free froi 



these pests. 



Mr. Bethune asked if there was any affinity between the Aphis 



the wild cherry and that of the hop. 



The President stated that the European Entomologists had come 



