1890.] NEW-YORK MICROSCOPICAL SOCIETY. 59 



by a demonstration of the process before the Society, and it is 

 published in this number of the Journal, p. 56. 



OBJECTS EXHIBITED. 



1. A new y^ inch Powell and Lealand Objective : by Albert 

 Mann, Jr. 



2. A " C " Eye-piece of Powell and Lealand, made from the 

 " New Glass " : by William G. De Witt. 



3. A " C " Eye-piece of Zentmayer : by William G. De Witt. 



4. Drosera rotundifolia^ with captive insect : by Geo. C. F. 

 Haas. 



5. Uirictdaria, with captive insect : by Geo. C. F. Haas. 



6. Diatoms of the genus Hyalodiscus : by E. A. Schultze. 



7. Diatoms of the genus Rhizosolenia : by E. A. Schultze. 



8. Spherules from slag of blast-furnace, showing multiple 

 images. 



9. Spicules from disintegrated chefty strata ; polarized. 



10. Quartz crystals from surface of iron ore (Hematite) ; 

 polarized. 



11. Section of fossil Coral ; polarized. 



"12. Diatoms from the lake, creek and springs of Birmingham, 

 Alabama. 



13. Selected Diatoms from the same. 



Nos. 8-13, inclusive, were prepared by K. M. Cunningham, 

 of Birmingham, Alabama, Corresponding Member of the Society, 

 and were exhibited by J. \.. Zaeriskie. 



The Corresponding Secretary read a communication from Mr. 

 Cunningham, containing information on many points of interest 

 in the slides prepared by him, and exhibited, as stated above, 

 and donating to the Society the said slides, together with the 

 following objects and material : 



Natural plate of crystals from bituminous coal of Birming- 

 ham. 



The same, uncovered, showing iridescence by slanting light. 



Nodule of fossil coral from Birmingham. 



A packet of joints of encrinite stems and crystals from 

 weathered limestone of Birmingham. 



Sand from disintegrated chert. 



Hollow grains from weathered limestone. 



Spherule dust from blast-furnace. 



