1114 PROCEEDINGS OF THE SOCIETY. 



as the invention of this Microscope Prof. Eiddell had applied two 

 mirrors for the purpose of equalizing the illumination in both fields. 



Mr. J. Beck said that the form of Binocular Microscope made by- 

 Prof. Eiddell was an extremely ingenious failure. He believed he 

 was quite correct in saying so, because it never came into practical 

 use at all ; whilst the merit of bringing the binocular into practical 

 use was undoubtedly due to Mr. Wenham. He saw the instrument at 

 New Orleans in the year 1871, but with the exception of that, and 

 the one on the table before them, there was never another made, be- 

 cause, though it was ingenious, it was not useful. Whenever a thing 

 was made which was useful, it would be sure to come into use, as was 

 shown in the case of Mr. Wenham's arrangement, for which the de- 

 mand had been enormous. Though he thought the instrument was 

 not of any great practical use, it was very useful to have these sac- 

 cessive stages in the history of the Binocular Microscope brought 

 before them. 



Mr. Crisp exhibited a " twin " simple Microscope having two 

 lenses of different powers (ante, p. 862), also two forms of magnifiers 

 sent by Mr. Hippisley as examples of the capabilities of lenses made 

 out of spherules of glass, and of a simple method of holding them. 



Mr. Badcock called attention to the fact of the re-discovery of 

 Cordylophora lacustris at the Victoria Docks, by Mr. C. Mitchell of 

 the East London Natural History Society. Some years ago it was 

 very abundant there, but since then it had entirely vanished until a 

 few weeks ago. Some further interest attached to it on account of 

 there being a quantity of Freia elegans parasitic upon it. The same 

 gathering also contained some Bacillaria paradoxa. 



The President regarded this as a highly interesting gathering, 

 especially that of the Bacillaria. 



Dr. Maddox read his paper, " Further Experiments on Feeding 

 Insects with the curved or ' comma' Bacillus" (supra, p. 941). 



The President thought the Society would be very pleased to have 

 before it the further results of Dr. Maddox's researches in this 

 direction, which was one in which there was not merely very much 

 of interest, but also much of practical importance yet to be learned. 

 The fact that no practical result had yet been arrived at was no doubt 

 disappointing, but it was, after all, only an incitement to still patiently 

 pursue the subject until it was overcome. ; 



Mr. Cheshire said that perhaps some of the difficulty experienced 

 by Dr. Maddox might be got over by using invert sugar instead of 

 the ordinary kind. By using barley sugar, or boiled sugar, they 

 would get it in a form which would not give up its moisture so soon. 



Dr. Maddox said he should prefer to feed the insects entirely on 

 fluid food, if it were possible to do so, but evaporation was the draw- 

 back there. 



Mr. Cheshire had some experience in feeding bees, and would 



