5 фев 1880 г. - Lesquereux also worked up the coal flora in the
second geological survey of Pennsylvania. The fruit of this
labour was two volumes of text and an atlas, published in 1880
Описание:
the most important work on carboniferous plants that has
been produced in America.
The publication of Brongniart's Prodrome, and the com-
mencement of the Histoire des V/g/taux Fossils, in 1828, laid
the solid basis upon which the science of paleobotany has been
erected. Lesquereux began to write on this subject in 1845,
and his studies in America have been directed especially in
the line of fossil botany. His most valuable researches, be-
ginning in 1850, lay in the study of the coal formations of
Ohio, Pennsylvania, Illinois, Kentucky, and Arkansas, and his
reports appear in the geological surveys of all these States.
He had conceived that his theory of the formation of peat
could be extended to the coal, and this proved to be the case.
Particularly important are his studies of the coal flora of Penn-
sylvania, published in the report of H. D. Rogers in 1858,
462 PIONEERS OF SCIENCE IN AMERICA.
together with a Catalogue of the Fossil Plants which have
been named or described from the coal measures of North
America. Lesquereux also worked up the coal flora in the
second geological survey of Pennsylvania. The fruit of this
labour was two volumes of text and an atlas, published in 1880
— the most important work on carboniferous plants that has
been produced in America. Geological work, especially re-
searches on fossil botany, in connection with the United States
Geological Surveys of the Territories, began in 1868 to absorb
his attention. He was employed to work up the collections of
Dr. F. V. Hayden's surveys of the Territories, and important
papers on the subject appeared in the annual reports of the
surveys from 1870 to 1874 inclusive. Lesquereux was fre-
quently called to Cambridge to determine the specimens of
fossil plants in Prof. Agassiz's museum, where he was a guest
in the naturalist's household for weeks and months at a time,
and their mutual attachment grew very strong.
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Bartram Barton
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