BULLETIN OF THE NATURAL HISTORY SOCIETY. 
227 
quantity is placed in the centre of the slide and on this is placed 
a single small drop of Canada balsam. The cover glass is next 
put on, and the slide being gently warmed, the balsam spreads 
beneath the cover, carrying any air bubbles with it, while by 
gentle pressure the former is made to take its final position. 
The exposed edges soon dry, and the slide is ready to be labelled 
and used. 
For the determination of Diatoms certain literature is 
required. It is hoped that the present series of articles, with the 
accompanying plates, will enable students in New Brunswick to 
recognize at least the genera of the more common and typical 
forms met with in the Province, and lists of all species so far 
observed will also be given, but to identify all of these it will be 
necessary to have access to standard works. The most generally 
useful of these, on account of the number and accuracy of its 
figures, is “ Smith’s British Diatomaceae,” which includes a 
great number of forms found also in America, but if to this the 
student can add copies of “ Van Heurck’s Diatoms of Belgium,” 
“ Castracane’s Diatoms of France,” and “Wolle’s Diatoms of 
North America,” he will be well equipped for work. Numerous 
more special articles are to be found iin the Smithsonian Contri- 
butions, in the London Microscopical Journal and in the Reports 
of various exploring expeditions. Type specimens may also be 
obtained from dealers but are expensive. 
I shall now proceed to give a tabulated list of all the marine 
and estuarine Diatoms so far observed about the coasts of New 
Brunswick, leaving the fresh water and fossil forms for later 
consideration. A figure representing at least one species of each 
genus will be given in the accompanying plates. For the more 
exact determination of a considerable number of the species 
indicated I am indebted to Dr. A. H. MacKay, of Halifax. 
