114 On the use of the Blow-pipe. 



We may now subdivide and form classes equally distinct, 

 to wit — 



1st, such as are fusible per se, with ordinary supports* 

 2d, such as are fusible per se, in microscopical particles. 

 3d, such as are fusible only with addition ; and, 

 4th, such as are infusible even with fluxes. 

 This subject requires yet much attention ; and I hope some 

 of the details given above may save from trouble and disap- 

 pointment such as may be disposed to diminish the list of infu- 

 sible minerals, or to simplify and extend the use of an instru- 

 ment, so indispensable to the mineralogist. 



On the Remains of the Megatherium recently discovered in 

 Georgia. By William Cooper. Read April 19, 1824. 



It has been already announced that remains of the great 

 fossil animal of Paraguay exist within the limits of the United 

 States ; and under a latitude nearly as far north, as they have 

 hitherto been found south, of the Equator. We are indebted 

 for the first intelligence of this discovery, which possesses so 

 much interest for the lovers of natural science, to our learned 

 associate professor Mitchill, distinguished by his previous 

 contributions to the knowledge of the fossil productions of 

 this country. In a paper contained in the present volume of 

 these Annals, that gentleman has given an account of two frag- 

 ments of teeth brought to him from an island on the seacoast 

 of Georgia, which, at the same time that they differed totally 

 from those of any quadruped now known to exist, presented 

 the most striking resemblance to those of the Megatherium. 

 To an animal of this very extraordinary,, and now extinct spe- 

 cies, he accordingly does not hesitate to refer them. 



The information thus given, however, was calculated rather 

 to stimulate than to satisfy the curiosity of naturalists. Al- 

 though the fact of these remains existing in North America 



