502 PHYSICAL GEOGRAPHY. 



APPENDIX. 



Newark, N. ]., September i, 1874. 

 Prof. C. II. Hitchcock, State Geologist : 



Dear Sir — As you request, I send what information I can at the present time con- 

 cerning the specimens of diatomacea: which I have received from you or others, or 

 collected myself in the state of New Hampshire, The specimens have been of two 

 characters. For the most part they have consisted of lacustrine sedimentary deposits, 

 and these have been collected by yourself, or the other gentlemen connected or not 

 connected with the survey. A few recent gatherings have likewise been sent to me by 

 you, or procured by myself and a friend, in and around Hanover and elsewhere. The 

 lacustrine sedimentary deposits are thirteen in number, and are from the following 

 localities: Bemis lake, Carroll county; Bowkerville, I- lt/.william ; Stamp Act island, 

 near Wolfeborough ; Littleton; Laconia ; Bristol; Chalk pond, Newbury; Epsom ; 

 Pike's pond, Stark; Bow; Cold pond, 2000 feet above the sea, one eighth mile from 

 Crawford house; Umbagog lake, Coos county; Concord. Besides these, I have 

 received prepared slides from Manchester and from Durham. 



As it may be of interest to those who study the diatomaccx to know, I will state 

 when and how these deposits came into my hands. 



Bemis Lake. The first specimen of this deposit was sent to me by Mr. Charles 

 Stodder, of Boston, Mass., in 1859. I examined it and published a list of the species 

 I found in it at that time in the Proceedings of the Boston Society of Natural History, 

 May 2, i860. This list is as follows : 



Cocconeina parvum. 



Cyclotella Kutaingiana. 



Cymbella cuspidata. 



Eunotia serra. 



Comphone/ua acuminatum . 



Ilimantidinin gracile . 



A T avicula affinis ; Navicula cuspidata; Navicula frma; Navicula interrupt a; Nav- 

 icula rJiyncocephala ; Navicula serians. 

 Nitzschia f 



Pinnularia major; Pinnularia stauroneiformis ; Pinnularia tabellaria; Pinuularia 

 viridis. 



Stauroneis phcenicentcron . 



Surirella biseriata ; Surirella linearis. 



Tabellaria fe nest rata ; Tabellaria Jlocculosa . 



I have again and more carefully examined this deposit, and find that I have to make 

 some corrections in the above list, as well as add to it ; but, as my investigation has 

 not been completed, I shall not at the present time make these corrections and addi- 



