66 Scieritijic Intelligence. [July, 



full of air gave the weight of the common air displaced by the 

 exhaustion = a. The weight of the exhausted flask subtracted 

 from that of the flask when full of hydrogen gas gave the weight 

 of the hydrogen gas introduced into the flask = b. It is obvious 



that the specific gravity of the hydrogen gas is -. Three suc- 

 cessive experiments were made, which gave each the same 

 result. We found the specific gravity of the hydrogen gas to be 

 006933. Thus these experiments confirm the conclusions 

 deduced by Dr. Prout from the specific gravity of ammoniacal 

 gas, and likewise the experimental conclusions of Berzelius and 

 Dulong, mentioned in the number of the Annals of Philosophy 

 for May last. 



In a former set of experiments which I made some years ago, 

 I found the specific gravity of hydrogen gas 0*073 ; but my appa- 

 ratus was not so delicate, and I did not take the precaution to 

 distil the zinc which I employed. 



II. Ore of Tellurium. 



Our mineralogical readers will be gratified to learn that the 

 ore of this very scarce metal has been recently discovered in 

 Connecticut. It occurs in a bismuth mine belonging to Mr. 

 Ephraim Lane, a fanner, at New Stratford, town of Huntington, 

 Connecticut. This mine has been sunk only to the depth of 10 

 feet. It affords native bismuth, native silver, magnetical and 

 common iron pyrites, copper pyrites (in crystals), galena, blende, 

 tungsten, tellurium, &c. 



In the third number of Dr. Silliman's American Journal of 

 Science, in which this discoveiy is announced, nothing is said 

 respecting the state in which the tellurium exists in this mine. 

 But it is stated that letters, post paid, addressed as above, will 

 find Mr. Lane, who will, for a reasonable compensation, pack 

 boxes, more or less extensive, for mineralogists and others. 



III. Native Copper. 



In Bruce's Mineralogical Journal (i. 149), mention is made of 

 a remarkable piece of native copper found near New Haven, in 

 Connecticut, many years ago, weighing about 90 lbs. Dr. Silli- 

 man has announced in the first number of his scientific journal 

 (p. 55), that another piece has been recently found half a mile 

 west of the Hartford turnpike road, opposite the town of Wal- 

 lingford, and 12 miles from New Haven. It was turned up in 

 ploughing to repair a road. The country is of the secondary 

 trap formation, and the rocks at the particular place are the old 

 red sandstone of Werner, which here occupies the plains, and 

 runs under the trap. The piece weighs almost 6 lbs. It is beau- 

 tiful virgin copper, with rudiments of large octahedral crystals 

 of native copper upon its surface, which is more or less incrusted 

 with green carbonate of copper, and ruby oxide, very much 



