189I.] NEW-YORK MICROSCOPICAL SOCIETY. 131 



"4. A packet of sand from the chert quarries near Birming- 

 ham, mainly composed of fragments of silicious, spicular bodies, 

 and curious as a polariscope object. 



"5. A packet of microscopic coral from a ledge on the Chat- 

 tahoochee River at Fort Gaines, Georgia. The ledge is of enor- 

 mous thickness and extent. The specimens were obtained by 

 sifting the chalky material through gauze. 



" 6. A packet of fossil granules from a stratum of iron ore, 

 excavated from the tunnel through the Red Mountain. The 

 specimen suggests waste coffee grounds. It is not pretty, but 

 contains a few microscopic snail-like shells. 



"7, Fulgorite from a white sand bank at Apalachicola Bay 

 Beach, Florida. If thin fragments of the cylinders are examined, 

 the interior will be seen to be vitrified and polished, and, being 

 full of gaseous bubbles (air ?), will show tension colors as a polari- 

 scope mount. 



"8. My attention having been drawn to certain blister-like 

 blemishes in the oyster shells at Apalachicola, Florida, a brief 

 examination showed that invariably under each blister a small 

 quantity of mud was sealed. Where the inside of the blister did 

 not touch the mud a great array of oyster-shell pearl particles 

 were strewn. Only one side of the blister presents the phenome- 

 non, and it forms an interesting object for the binocular. 



" 9. Two smoothed fragments of a colossal vertebral joint from 

 the cretaceous formation of Alabama. These specimens, proba- 

 bly from the vertebra of Zeiiglodoji, are curious as being fossil 

 bone. Two of these joints superposed are as large as a month- 

 old baby." 



OBJECTS EXHIBITED. 



1. Arranged slide of 275 Diatoms from the Sendai deposit, 

 Japan, prepared by Rev. Albert Mann, Jr.: by E. A. Schultze. 



2. Section of wood of Hemlock, Tsuga canadensis Cam, polar- 

 ized : by E. G. Love. 



3. Photomicrograph of Plcurosigma angulatutn, taken by Dr. 

 Clifford Mercer with a dry |, air angle 1.40, to show progress 

 made in the manufacture of lenses : by William Wales. 



4. Larvse of Gerris, of different ages : by J. L. Zabriskie. 



5. Unknown larva of a Cecidomiid Fly, mining the leaves of 

 the Red Cedar, Juniperus virginiana L. : by J. L. Zabriskie. 



