74 Prof. H. How on Oil-Coal. 
ing the analogy of distribution of the flora of both epochs. It 
shows the same degree of difference and of analogy. Some 
Species, even a few types, peculiar to each country, the greatest 
number of them peculiar to America; many identical species, and 
especially many forms, so nearly related, that it becomes very 
difficult to separate them by specific characters. 
Columbus, Ohio, April, 1860. 
(To be continued.) 
Art. X.—On an Oil-Coal found near Pictou, Nova Scotia; and 
the Comparative Composition of the Minerals often included in 
the term Coals; by Henry How, Prof. Chemistry and Nat. 
Hist., King’s College, Windsor, N. S. 
THE name given to the substance I purpose describing indi- 
cates the use to which it is put, viz., the manufacture of paraf- 
of that word;” and, as regards the latter, it was decided at 
Fredericton, N. B,, 1852, and at Halifax, 'N. S., to be also a 
coal. Notwithstanding these legal decisions, which, from the 
