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. 



Lesquereux, during his long and industrious life, contrib- 

 uted twelve important works to the natural history of North 

 America, besides a large number of memoirs on divers sub- 

 jects, amounting in all to about fifty publications. He was a 

 member or correspondent of more than twenty scientific so- 

 cieties of Europe and America, and was the first elected mem- 

 ber of the National Academy of Sciences. The degree of 

 LL. D. was given him in 1875 by Marietta College. He was 

 in close correspondence with all the leading paleontologists of 

 Europe, Oswald Heer being one of his particular friends. 



The characteristic works of the most eminent scientific 

 writers of the age comprised his library. Brongniart, who 

 laid the foundation of paleobotany; Goppert, who built its 

 superstructure ; Schimper, Heer, Dawson, Ettingshausen, New- 

 berry, the Marquis Gaston de Saporta, together with Grande 

 Eury and Renault, who thoroughly studied the carboniferous 

 flora of France ; Williamson, who mastered that of England ; 

 Nathorst, who opened up the subterranean floral treasures of 

 Sweden ; Engelhardt, Hosius, Under Marck and Schenk, who 

 investigated without exhausting the rich plant beds of Ger- 

 many all were numbered among Lesquereux's friends and 

 correspondents. 



The fraternal bond that binds the scientific world is almost 

 indissoluble. When once asked if his long and intimate associ- 



