^^"^■5 BIOGRAPHICAL SKETCHES. 377 



The connecting link between this study and that of fossil plants was 

 supplied two years later, when he wrote a short paper '< Sur les plantes 

 qui forment la houille."" 



On his arrival in America he studied the coal formations of Ohio, 

 Pennsylvania, Illinois, Kentucky, Arkansas, and other States, and his 

 reports appear in those of the geological surveys of all of these States. 

 Especially important are those upon the coal flora of Pennsylvania. 

 The first of these appeared in the second volume of the report of H. D. 

 Eogers, in 1858, consisting of some quite elaborate " General Remarks," 

 and a "Catalogue of the Fossil Plants which have been Earned or De- 

 scribed from the Coal Measures of North America." This is accom 

 panied by twenty-three excellent plates. But this was a mere begin- 

 ning, for when the second geological survey of Pennsylvania was un- 

 dertaken Mr. Lesquereux was employed to work up the coal flora, 

 which appeared in 1880 in a volume of text and an atlas, the most im- 

 portant work on carboniferous plants that has been produced in Amer- 

 ica. A third volume, supplementary to these, has just been issued. 



In 18G8 Mr. Lesquereux began the study of the floras of later forma- 

 tions in the West, and contributed an important paper on the Cretaceous 

 leaves of Nebraska to the "American Journal of Science."" Dr. F. V. 

 Hayden employed him to work u^j the collections of his surveys of the 

 Territories,' and important papers on the subject appeared in the annual 

 reports of the survey for 1870, 1871, 1»72, 1873, and 1874, In the last 

 of these years appeared his "Cretaceous Flora," forming Volume VI of 

 the quarto rejjorts. In 1878 the seventh volume of these quarto reports 

 was published, a still larger work, devoted to what he called the " Ter- 

 tiary Flora," though a very large proportion of- the species were from 

 the Laramie Croup. The eighth of these volumes will also be by Mr. 

 Lesquereux, and will consist of a thorough revision of the entire Creta- 

 ceous and Tertiary floras of North America. Mr. Lesquereux is still liv- 

 ing, and though infirm with age is actively engaged in bryological and 

 paleontoTogical studies. 



14. Dawson. — To Sir J. W. Dawson is due the greater part of the knowl- 

 edge we possess concerning the vegetable paleontology of Canada and the 

 British North American provinces in general. His numerous papers, run- 

 ning back as far as 1845," are almost exclusively confined to the descrip- 

 tion and illustration of material from this part of the world, and all 

 exce])t a few recent ones relate to the older formations of the East. 



''Archives des sciences physiques et naturelles (Bibliothfeque universelle), Tome VI, 

 1847, pp. 158-162. Genfeve. 



"On Some Cretaceous Fossil Plants from Nebraska. Am. Journ. Sci., 2d series. 

 Vol. XL VI (July, 1868), pp. 91-105. 



'^His paper "On the Newer Coal Formation of the Eastern Part of Nova Scotia" 

 (Quart. Journ. Geo]. Soc. Lond., Vol. I, 1845, pp. 322-330) merely names a few genera 

 occurring there, but his "Notices of Some Fossils Found in the Coal Formation of 

 Nova Scotia" (1. c, Vol. II, 1846, pp. 132-136), giving his views on Sternbergia, at- 

 tracted immediate atteiition. 



