Additional Notes. 4^25 



ing their character. It is by no means improbable, tlierefore, 

 that the ancestors of the animals now living in South America 

 had once a northern constitution; that, after crossing the strait 

 between Asia and America, they gradually strayed further s<nitl» ; 

 and that, in process of time, their offspring acquired southern 

 habits and constitutions. 



Nor is it by any means difficult to suppose, that these fossTl 

 exnvia; were deposited in Uie places where they are found, at 

 the subsidence of the waters of the general deluge. They liavc 

 been generally found in circumstances calculated long to preserve 

 them ; in strata of earth which tend to resist putrefaction, and 

 which may account for their remaining entire after so great a lapse 

 of time. 



Note (Z)y p. 181. — At the close of the eighteenth century, 

 only five dissertations, it is believed, had been published by the 

 medical graduates of America on botanical subjects. Tliese are 

 respectfully noticed in the above-mentioned page. Since that 

 time, publications of this kind have considerably multiplied. 

 The learned and interesting lectures on botany, delivered by 

 professor Barton, of the university of Pennsylvania, and his en- 

 lightened zeal in pursuing this branch of science, have produced 

 a very sensible effect in recommending it to the attention of 

 tlie students in that seminary. In the course of the last three 

 years, tlie following dissertations on botanical subjects have been 

 added to the former small list. 



1. On the Digitalis Purpurea, by John Moore, of Pennsylva- 



nia. 



2. On the Kalmi'i. J^atifolia and AngusiifoUa, by George Tliomas, 



of Virginia. 



3. On the Melia Azedarach, by Grafton Du\a], of :\Iary^ 



land. 



4. On tlie Primus Virginiana, by Charles Morris, of \'iiginia. 

 $. On the Liriodendron Tulipifcra, by Patrick Rogers, oi he- 



land. 

 Q. On the Magnolia Glaucn, by Thomas D. Price, of Virginia. 



7. On the Spigdia Mari/landica, by Hedge Thompson, of New 



Jersey. 



8. On the Sanguinaria Canadensis, by William Downej', of 



Maryland. 

 g. On the Bignonia Catalpa, by Robert Holmes, of Virginia. 



