Marcow’s Geological Map. 199 
Williamson in a paper read before the British Association in 
July, in 1851, has expressed the same ideas with regard to the 
typical relations of water, and is recognized by the English edi- 
tor of Gmelin’s Handbook (vol. vii, pp. 17 and 201) as the au- ° 
thor of the theory. See also Brodie’s lecture before the Royal 
Institution in May, 1853, (Chemical Gazette, Aug., Ist) “On the 
formation of hydrogen and its homologues.” 
It is gratifying to find that the views which [ have so long 
maintained, are at last recognized by chemists, and are found pro- 
ductive of beautiful and important results; but it would be only 
just in these chemists, to have admitted the priority, by three or 
four years, of my own published views, anticipating the brilliant 
series of discoveries which have served them as the basis of their 
generalizations. 
ontreal, Dec. 20, 1853. 
Arr. XIX.—Notice of a Geological Map of the United States 
and the British Provinces of North America, with Explana- 
tory Text, Geological Sections and Plates of the Fossils whic: 
characterize the formations,* by J. Marcou. 
Ing had been done by geologists in America :—notwithstanding 
the publication in this period of the Final Report on the geology 
New Jersey, the first Final Report on Massachusetts, the An- 
that from 1828 to 1839, when Murchison’s work appeared, noth- 
* A Geological Map of the United States and the British Provinces of North 
Bites, Wah ccpletriry tai veslogiea), vects 4 plates of the fossils which 
anat logieal sections an ates of the fossils w 
characterize ki enrevteert d oc ie rae , Uni ess Geologist, member of 
d & Lincoln. 
0 
the Geological Society of France, ete. etc. Boston, G & 
