l886.] NEW-YORK MICROSCOPICAL SOCIETY. 125 



PROCEEDINGS. 



Meeting of October ist, 1886. 



The President, the Rev. J. L. Zabriskie, in the chair. 

 Twenty-eight persons present. 



objects exhibited. 



1. Cladocarpus flexilis : by H. W. Calef. 



2. Gizzard of Cricket : by J. D. Hyatt. 



3. Section of Chalcedony : by J. D. Hyatt. 



4. Section of Coscinodiscus : by E. A. Schultze. 



5. Diatoms (218 forms) from the newly discovered deposit at 

 St. Peter, Hungary : by E. A. Schultze. 



6. Crystals of Native Gold from California : by W. G. De- 

 Witt. 



7. Seeds of Common Carrot {Daucus Carota, L.) : by W. E. 

 Damon. 



8. Stamen of Moth Mullein ( Verbascum Blattaria, L.) : by 

 J. L. Zabriskie. 



9. Ovary of Moth Mullein {Verbascum Blattaria, L.) ; trans- 

 verse section : by J. L, Zabriskie. 



10. Natural and Artificial Rubies : by G. F. Kunz. 



A cover-carrier for immersion and dry lenses. 



Mr. Wales exhibited a non-adjustable i-5th inch objective 

 with a cover-carrier, or cap. 



He said that the idea of affixing a cover-carrier to a lens 

 occurred to him because of the fact that opticians are frequently 

 held responsible for errors of the manipulator in the use of 

 non-adjustable lenses — that a non-adjustable lens corrected for 

 a ten-inch tube would sometimes be used on an eight-inch tube, 

 and, this failing to produce good results, the optician would get 

 the credit for making a poor lens. 



Hence he had fitted a cover-glass to a cap made to screw on 

 to the front cell, or fitting over the objective, and had adjusted 

 and corrected the lens for that particular cover-glass, so that 



