THE FRESH WATER DIATOMS AND DIATOMACEOUS 
EARTHS OF NEW BRUNSWICK. 
By L. W. Bailey, LL. D., F. R. S. C. 
In the last Bulletin of this Society the writer gave a general 
account of the structure and relations of Diatoms, together with 
lists and illustrations of the marine and estuarine forms which, 
up to that time, had been observed along the New Brunswick 
seaboard. He now proposes to enumerate and describe the 
related forms to be found in the fresh waters of the Province 
as well as those which, in a semi-fossil form, are to be found 
in connection with some of the lakes and ponds of the latter, 
constituting what are variously known as Diatomaceous 
Earths,” “ Infusorial Earths,” and “ Tripolite.” 
I.— FRESH WATER DIATOMS. 
In attempting to enumerate the fresh water species of • 
Diatoms a difficulty is at once met with, viz., that of determining 
what forms are really of this character as distinguished from 
those which are typically marine. Such species as are found in 
lakes and ponds, or in running streams, are of course fluviatile 
or lacustrine, but, where these empty into the sea, they may be 
carried into the latter, and thus to some extent becohie 
commingled with marine forms. Moreover, when, as is the case 
particularly with the St. John River and the IMiramichi, these 
are really estuarine, and are brackish for many miles above 
their mouths, the presence of saline conditions, even though in 
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