620 THE JOURNAL OF GEOLOGY. 
greenish schists on the western border of the Triassic in south- 
ern Connecticut. 
Two papers were written upon the first subject, viz. : ‘““On the 
rocks of the Helderberg era, in the valley of the Connecticut,” 
1873, and “The Helderberg formation of Bernardston, Mass., 
and Vernon, Vermont,” 1877. The fuller, elaboration of the 
stratigraphy and of the fossil contents were made by Professor 
B. K. Emerson of the Massachusetts survey. The other problem, 
about which the paper on ‘The ‘chloritic formation’ on the 
in 1876, and remarks 
in the ‘‘Geology of the New Haven region,” 1870, opened the 
d 
western border of the New Haven region,’ 
discussion, was not satisfactorily finished at the time of his death. 
It involves questions in metamorphism which call for petro- 
graphical as well as geological investigation, and whose solution 
must be left for other workers. 
The preparation of the Manual of Geology was perhaps 
the greatest of his contributions to geology; of its value every 
geologist of America knows. It has done more to unify and 
codify American geology than any other work, and until very 
recent years, if we may judge from their literary quotations, 
foreign geologists have made Dana’s Manual their chief source 
of information regarding the geology of America. It has always 
been characterized by that accuracy, and that fullness of details 
collected with a rare selective judgment, which has made it for 
every worker an indispensable handbook. In the last edition, 
which was finished but a few months before his death, he has 
combined the results of personal revision by the active workers 
in the more recently explored fields, with his own full knowl- 
edge of the current literature, to make it a complete account of 
the state of the science at the time of its publication. 
In the breadth and richness of his knowledge an equal to 
Professor Dana is not likely to arise. For the thoroughness and 
industry which he applied to all his investigations, the fairness 
with which he treated all with whom he could not agree, the 
kindness and consideration he showed to all, and the unswerving 
devotion to the truth, James Dwight Dana will be long remem- 
