1885.] NEW-YORK MICROSCOPICAL SOCIETY. 19 



Eye of Insect, showing Hexagonal Form of Facets : by Ed- 

 WARD G. Day. 



Section of Eye of Limulus : by J. D. Hyatt. 

 Parasite found on a Mosquito : by J. D. Hyatt. 

 Section of Spore Coal : by M. M. Le Brun. 

 Pond-life : by A. D. Balen. 



1. Volvox minor. 



2. Actinosplicenum Eichornii. 



Of Spore Coal, Dr. Britton said : " I have here specimens of 

 Huron shale from Ohio, in which the bodies supposed to be 

 spores from the Lycopods of that period are well shown. These 

 bodies are small, black, globular, of uniform size, and without 

 discernible structure ; and they occur in enormous quantity 

 throughout the deposit. An interesting article on this subject, 

 from the pen of Prof Orton, was published in the Proceedings 

 of the Montreal meeting (1882) of the American Association for 

 the Advancement of Science." 



Mr. E. A. Schultze, in an article printed elsewhere in this 

 Number of the Journal, set before the Society the efforts which 

 have been made in Europe to employ successfully the electric 

 light in microscopical work. For researches requiring the use 

 of high-power objectives, it had been found superior to all other 

 kinds of artificial illumination. Dr. Theodor Stein had devised 

 a rheostat which brings the electric current under easy and per- 

 fect control, thus securing safety to the lamp and constancy to 

 the intensity of the light. 



Dr. F. Y. Clark said: " In my experiments in the use of elec- 

 trical illumination, I have found the chief obstacle to success to 

 consist in the difficulty of getting a suitable battery. I have, 

 however, finally procured one which works admirably. It is the 

 Haid Electric Battery, a recent invention, and was made by the 

 Excelsior Manufacturing Co., of this city. It has three elements, 

 and it runs from one to three hours. It is portable — it can be 

 carried in one's pocket, and it is easily managed. In my experi- 

 ence the electric light is far the best for the examination of ob- 

 jects, be they transparent or opaque ; and it does not weary my 

 eyes." 



Mr. P. H. Dudley : " I have tried to use the Galvanic current 

 for illumination in photomicrography, but have found its action 

 too inconstant. You may not always, by the eye, notice the 



