504 PHYSICAL GEOGRAPHY. 



All of these, with the exception of Nos. 6 and 7, are my collections. Nos. 6 and 7 

 you sent me. 



Besides these gatherings, I have received fresh-water diatomaceae from the following 

 localities in New Hampshire, through the kindness of Mr. R. C. Greenleaf, of Bos- 

 ton, Mass. : 



Lake Mouran, on Cannon mountain, 1865. 



Saco river, 1865. 



Echo lake, 1865. 



Profile lake, 1865. 



Spring near Tip-top house, Mt. Washington, 1865. 



Small pond near Crawford's, 1865. 



Spring near Lake Mouran, 1S65. 



Pond on Mt. Lafayette (Lake Greenleaf). 



Snow arch, Tuckerman's ravine. 



Androscoggin river, Gorham. 



Gibbs falls, Crawford. 



Brook in Bethlehem. 



In June, 1862, Mr. Charles Stodder sent me a specimen of a lacustrine sedimentary 

 deposit, labelled "New Hampshire: locality and history entirely unknown; sent by 

 some one in Lawrence to Mr. Ordway, of Manchester, N. H." 



In Ehrenberg's Mikrogeologie, T. XXXV, A. VI, is represented a deposit of diatom- 

 aceas said to come from Perth, N. H. [?], and this is mentioned as described in the 

 Transactions of the Berlin Academy for 1843. I n the same work, T. XXXIII, X, is 

 represented another similar deposit from New Hampshire, more particular locality 

 not being mentioned. This is said to be described in the Transactions of the Berlin 

 Academy for 1845. This work is not accessible to me at the present time ; therefore I 

 am unable to give the particulars mentioned by Ehrenberg concerning them. 



These, then, constitute all of the material I possess up to the present time represent- 

 ing the diatomaceae of the state of New Hampshire, and as soon as I shall be able to 

 work up the forms contained in them I will transmit you a full report thereon. In the 

 meantime it is extremely desirable that we should receive recent collections from other 

 parts of the state ; and I would particularly call attention to the fact that we have not, 

 as yet, received any gatherings from brackish or salt-water. Specimens of marine 

 algae encrusted with diatomaceae, as they almost always are, would be particularly 

 acceptable. Respectfully yours, 



A. MEAD EDWARDS, M. D. 



Newark, N. J., September 1, 1874. 

 Prof. C. H. Hitchcock, State Geologist : 



Dear Sir I have thought that it might prove of interest to students of the 

 Desmidiae to know that while making collections of diatomaceae in and around Han- 



