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256 ENTOMOLOGICAL NEWS. [October, 



In the business session the report of this Committee on co operation 

 was brought up for consideration, but owing to the length of the program 

 was laid over for the last session, and was finally left without action. 



Mr. C. L. Marlatt read "Some Notes on Insecticides," among which 

 tests of the combined kerosene and water mixture were most interesting 

 and instructive. It was found that the machinery devised for this purpose 

 still left much to be desired, and that it was not possible to rely with cer- 

 tainty upon a uniform proportion of the kerosene and water. The effec- 

 tiveness of the mixture, however, was commended. On the same subject 

 was a paper by Mr. H. E. Weed, entitled "Experiments with the Knap- 

 sack Kerosene Attachment." In this he detailed the results of a spray 

 of the mixed kerosene and water as compared with the emulsion, and it 

 is found that the emulsion is, on the whole, a little more active; but that 

 the water mixture is just as effective when a somewhat larger percentage 

 of kerosene is used, and is a little injurious to foliage. The paper does 

 not deal with the mechanical difficulties, but rather with the effectiveness 

 of the kerosene and water not first emulsified. Yet, upon the same sub- 

 ject was a paper by Mr. Clarence M. Weed, which dealt with the mechan- 

 ical difficulties, and suggested as a solution a narrow kerosene receptacle 

 of the same heighth as the main tank, and containing just exactly the 

 necessary proportion of kerosene to the water. This kept water and 

 kerosene on the same level constantly, and in his experience the propor- 

 tion in the spray was then also constant. 



A paper by Mr. Aldrich, entitled "Spraying without a Pump," was 

 then read and illustrated by means of blackboard sketches. The device 

 is adapted only where water pressure is available, and indicates a method 

 of attaching a receptacle with poison in such a way that the stream of 

 water will carry a definite proportion with it during the process of spray- 

 ing. In the discussion which ensued upon this, a number of devices of 

 the same general character were described, and there was a somewhat 

 general discussion as to the possibility of getting a receptacle from which 

 the distribution of poison would be uniform. 



Continuing the same subject of insecticides, Mr. J. B. Smith read a 

 paper on "The uses of Insect Lime," in which he described a series of 

 experiments made with an imported preparation known as " Raupenleim," 

 and an American substitute which he had secured, and which is called 

 " Dendrolene." He finds that it is practical to use these materials in the 

 orchard for certain purposes, and that protection against many different 

 kinds of borers can be obtained by an intelligent use of one or the other 

 of these materials. Both are said to be petroleum products in the nature 

 of an exceedingly impure vaseline. In the course of the discussion Mr. 

 Davis reported good success with this material against the Canker worm 

 in Michigan, while Prof. Fernald mentioned a somewhat less favorable 

 result against the same insect in Massachusetts, due in this case to the 

 fact that the cold of early morning chilled the preparation, so as to make 

 it possible to be traversed by the insects. He also described the uses 



