1866.] 75 [Greenleaf. 



He also gave the following list of Diatomaceoe found in a 

 deposit of remarkable purity, by Col. Crockett, in a peat 

 swamp near Lake Winisquam in Laconia, N. H., and pre- 

 sented two slides of mounted specimens. This deposit was 

 a very valuable fertilizer, and had been used with great suc- 

 cess on the surrounding land. 



Stauronels pboenicenteron. Himantidium gracile. 



" Ballyii. Navicula I'ectangulata. 



" gracilis. " firma. 



Pinnularia major. " sp. 



" viridis. NItzschia scalaris. 



" stauroneiformis. Gomphonema acuminatum. 



" nobilis. Tabellaria fenestrata. 



" lata. Cocconema lanceolatum. 



" mesolepta. Cymbella cuspidata. 



" divergens. Melosira ? sp. 



Himantidimu bidens. Encyonema sp. 



" arcus. Sponge spicules. 



Mr. Charles Stodder reported upon the collection of Dia- 

 tomaceae from the alpine summits of the White Mountains of 

 New Hampshii'e, recently made and presented by Dr. Bemis. 



The forms found by Dr. Bemis upon the summit of Mount Craw- 

 ford, Navicula dicephala Ehr., were very minute. This pecuHarity 

 was also noticed in those found by Dr. A. A. Gould upon the summit 

 of Mount Mansfield ; those occurring upon the summit of Mount 

 Washington, obtained by Mr. Greenleaf, were found to be very mi- 

 nute forms ; such as Odontella, Denticula, etc. 



He had identified Stauroneis gracilis and Pinnularia viridis from 

 " South Field " and Flabellaria ventricosa Kutz, Fragillaria virescens, 

 Himantidium sp., Navicula rhomboides (small variety,) and a species of 

 Synedra from a Sphagnum swamp in Hartt's Location, N. H. 



Section of Microscopy. October 10, 1866. 



The Curator in the chair. Nine members present. 



The following paper was presented : — 



On Infusorial Earth from Peru. By Charles Stodder. 



In July, 1865, Dr. C. F. Winslow exhibited to the Society a spec- 

 imen of "Infusorial earth" from a locality discovered by himself about 



