1892.] NEW-YORK MICROSCOPICAL SOCIETY. 93 



milled head, slightly projecting beyond the microscope stage, 

 and having at the other end a pinion engaging in a crown-wheel, 

 fastened to the tube containing the prism. 



Annual Exhibition, April 22D, 1892. 



The Thirteenth Annual Exhibition of the Society was held at 

 the American Museum of Natural History, Central Park, New 

 York City, on the evening of April 22d, 1892. 



The objects exhibited, as noted in the programme below, were 

 displayed in the large hall of the first floor of the Museum. 

 During the evening there were three exhibitions of thirty minutes 

 each in the spacious Lecture Room adjoining, as follows : At 

 8 clock — Exhibition of Lantern Slides of Photomicrographs, by 

 E. G. Love. At 9 o'clock — Exhibition of Lantern Slides of 

 Diatoms, by C. F. Cox. At 10 o'clock — Exhibition of Micro- 

 scopic Objects with polarized light by E. C. Bolles. 



PROGRAMME. 



1. Old Microscopes and Accessories (Alcove No. i). Loaned 

 by C. F. Cox, J. L. Zap.riskie, Wm. Wales, F. D. Skeel, L. 

 ScHONEY, and the American Museum of Natural History : by 

 Wm. Wales. 



2. Method of Grinding and Mounting Lenses for the Micro- 

 scope (Alcove No. i) : by Wm. Wales. 



3. Transverse Section of the Pad of a Cat's Foot, showing 

 "touch " corpuscles : by Geo. E. Ashby. 



4. Saws of Rose Saw-fly : by Geo. E. Ashby. 



5. Transverse Section of the Stem of Cycas revoluta : by Geo. 

 E. Ashby. 



6. Revolving Stage with eleven objects : by Thos. Taylor. 



7. Sponge Spicules, Barbadoes : by E. J. Wright. 



8. Crystallized Zinc Oxide : by Frederick Kato. 



9. Hydromagnesite, Hoboken, N. J.: by J. W. Freckelton. 



10. Sunstone, a variety of Feldspar, Sussex County, N. J.: 

 by A. H. Ehrman. 



11. Arachnoidiscus in situ on Seaweed : by F. E, Bloodgood. 



12. Microphotograph, The Madonna, Raphael : by A. Wood- 



