410 Harems Substitute for 



2. Both oxyd of tungsten, and oxyd of tellurium were ob- 

 tained from all of them. 



3. Many specimens have been examined which have afforded 

 tungsten only, and no tellurium. 



At a convenient time, it is hoped that a more complete exa- 

 mination of this subject may be presented to the public. 



In the mean time, we may submit to mineralogists and che-- 

 mists, whether if this is not a new mineral, it is not at least a 

 new association of two minerals before known. It has not 

 been forgotten that gold and silver are frequently combined 

 with tellurium : neither of them has, however, been disco- 

 vered, (although sought after by proper tests) during the above 

 trials. 



Yale College, March, 1819. 



Art. XVIII. Ji Substitute for Woulfe''s or NootK's Appa- 

 ratus, by Robert Hare, M. D. Professor of Chemistry 

 in the Medical Department of the University of Pennsyl- 

 vania, and Member of various Learned and Scientific 

 Societies. With a Plate. 



JC EW subjects have more occupied the attention of chemists, 

 than the means of impregnating fluids with gaseous substances. 

 The contrivances ofWoulfe and Nooth, especially the former, 

 have been almost universally used ; and have gained for the 

 inventors merited celebrity. Various improvements in 

 Woulfe's bottles have been devised. Still I believe an appara- 

 tus replete with similar advantages, but less unwieldy, less 

 liable to fracture ; and having fewer junctures to make at each 

 operation, has been a great desideratum with every practical 

 chemist. It has, however, ceased to be so with me, since I 

 contrived the apparatus which I am about to describe. 



Fig. 1. represents 3 jars placed concentrically within each 

 other, and so proportioned and situated, as to admit 2 open- 

 necked concentric bell glasses alternately between them. The 



