126 PIONEERS OF SCIENCE IN AMERICA. 



tin of the Geological Society of France, a memoir on the 

 organic remains and fossils of Tennessee ; and in Silliman's 

 American Journal of Science and the Arts, articles on Amber at 

 Cape Sable, Maryland ; Minerals of Missouri ; Coral Regions 

 of Tennessee; Analysis of a Meteorite from Tennessee; Me- 

 teoric Iron from Tennessee and Alabama ; A Shower of Red 

 Matter in Tennessee ; Three Varieties of Meteoric Iron ; Me- 

 teoric Iron of Murfreesboro, Tenn. ; and Krausite and Caco- 

 rene in Tennessee. His last writing, forwarded to the Smith- 

 sonian Institution for publication only a few weeks before his 

 death, was a monograph on the rare and hitherto undescribed 

 encrinites of Tennessee, with accurate and beautiful drawings, 

 from specimens in the doctor's cabinet. 



He gathered a collection of about fourteen thousand min- 

 eralogical and more than five thousand geological specimens, 

 besides a large number of shells, and relics from Indian mounds, 

 constituting what was at the time considered the finest cabinet 

 belonging to a single person in the United States. This cabi- 

 net was sold in 1874 by his heirs to the Louisville (Ky.) Pub- 

 lic Library for twenty thousand dollars. His specimens in 

 comparative anatomy, zoology, and botany were disposed of 

 before his death. Besides the Philadelphia Academy, he was 

 a member of the American Philosophical Society, the Geologi- 

 cal Society of Pennsylvania, the Geological Society of France, 

 and of other scientific bodies in America and Europe. 



A minute adopted by the Board of Trustees of the Univer- 

 sity of Nashville, on the occasion of the death of Prof. Troost, 

 relates that, " born and liberally educated in Holland, he early 

 manifested a zealous devotion to natural history and chemis- 

 try, more especially to the then infant sciences of geology and 

 mineralogy. With a view to the more successful pursuit of 

 his favourite studies he visited Paris, and was for several years 

 the pupil of the celebrated Haiiy. He removed to the United 

 States about forty years ago, and in due time became an Amer- 

 ican citizen. His entire life was consecrated to geology and 

 the kindred sciences, with what ability and success his pub- 

 lished writings and his well-earned reputation at home and 

 abroad may eloquently testify. As a professor in this univer- 

 sity during the last twenty-two years and a State geologist of 

 Tennessee for the most part of that period, he won the confi- 

 dence and respect of the community by invaluable service in 



