PROCEEDINGS OF THE SOCIETY. 127 



ment if more attended the same, for objects were often exhibited aud 

 discussions frequently took place that perhaps might not be suitable at 

 the ordinary Meetings, but were, nevertheless, of great interest to those 

 who studies were in some particular direction. 



Dr. Hebb said that he was present at the last Meeting of the 

 Biological section on December 4, when Mr. E. J. Spitta gave a 

 beautiful demonstration of the value of the application of the cinemato- 

 graph to photomicrography. Various aspects of Pond Life, animal 

 aud vegetable, were thrown ou the screen and exhibited with remarkable 

 fidelity. The demonstration was given at Mr. Banfield's studio, and it 

 was his skill and knowledge of the cinematograph which made the 

 demonstration a complete success. He therefore proposed a special vote 

 of thanks to Mr. Banfield for his courtesy and kindness. 



The Chairman said he felt greatly indebted to Mr. Banfield for his 

 kind assistance, for without his very great kindness, he, the Chairman, 

 would have not been able to have shown the section his films. 



The Chairman added that he had been requested to announce that 

 the next Meeting of the " Brass and Glass " section would be held on 

 January 26, when the subject of low-power illumination was to be dealt 

 with. 



Dr. Marshall Ewell's paper " On a Convenient Form of Stand for 

 Use as a Micro-colorimeter and with Micro-spectroscope," was read by 

 Dr. Hebb, diagrams in illustration being shown upon the board. 



The thanks of the Meeting were voted to Dr. Marshall Ewell for his 

 communication. . 



Dr. James F. Gemmill's paper on " An Automatic Aerating 

 Apparatus for Aquaria," was also read by Dr. Hebb, the drawings 

 referred to in explanation being reproduced upon the board. 



The Chairman said that it was always somewhat difficult to 

 thoroughly grasp at the moment descriptions of new apparatus, especi- 

 ally when of a somewhat complicated kind, but the design of the author 

 was very ingenious, and deserving, undoubtedly, of their best thanks : 

 he felt sure those present would desire to return their thanks to the 

 author for his communication. 



Mr. F. Enock then gave a lecture " On the Life-history of the 

 Hessian Fly, with Notes on the Tenby Wheat Midge," the subject being 

 illustrated by a number of beautiful coloured lantern slides, showing 

 the various stages from the egg to the perfect insect, and the effect of the 

 ravages of the larva upon the stems of the affected corn. Although known 

 in America as far back as 1776, and believed to have been introduced there 

 in the straw mattresses of some Hessian troops, it was not until 1886 

 that public attention was called to it in this country. The fallacies 

 then circulated were described and corrected, and the true life-history, 

 as traced by the lecturer, was given. Some notes on observations on 

 the Tenby Wheat Midge, Clinodiplosis equestris, followed, and were 

 illustrated by lantern slides, and by the exhibition of a living larva 

 under the Microscope. 



