Intelligence and Miscellaneous Articles. 311 



INDIGO COPPER-ORE. 

 Demselben has obtained from a specimen of this mineral from 

 Hansbaden, specific gravity 3-8. 



Copper 64-773 



Sulphur.... 32-640 



Lead 1-046 



Iron 0-462 



98-921 



lb. J). 158. 



SPECIFIC HEAT OF GASES. 



MM. Aug. de la Rive and F. Marcet having made numerous ex- 

 periments on the above subject, have arrived at the following con- 

 clusions : — 



1st, That equal volumes of all gases under the same constant pres- 

 sure, have the same specific heat. 



2dly, That all other circumstances being equal, the specific heat of 

 all gases diminishes with diminished pressure, in a slightly conver- 

 ging series, and in a much less degree than that of the pressures. 



3dly, That each gas has a different conducting power; that is to 

 say, all gases have not the same power of communicating heat. — Ann, 

 de Chim. et de Phys. 



COMPOSITION OF APATITE. 



Mons. G. Rose remarks, that Berzelius having observed that the 

 analyses of apatite by Klaproth and Vauquelin gave results which 

 agreed with each other and also with definite proportions, he did 

 not think it necessary to analyse it again. M. Rose, however, finds 

 that 100 parts of apatite from the following places, contained the 

 annexed proportions of chloride and fluoride of calcium, — the re- 

 mainder being phosphate of lime, with a small quantity of iron and 

 magnesia in some cases, but quite accidental and unimportant. 



Chloride of Fluoride of 

 sp. gr. Calcium Calcium 

 Apatite from vSnarum in Norway .... 3 174 4"2S0 4*590 



Cabo de Gata in Spain. . 3 2^5 0-885 7-049 



Arendal 3-194 801 7-010 



Greiner in the Tyrol .. 3-175 0150 7*690 



Faldigl in the Tyrol 3166 O-IOO 7-620 



Saint Gothard 3-197 a trace 7 690 



, Ehrenfricdersdorf 3-211 ditto. 7690 



Ibid. 



NOTICE OF FOSSIL TREES, NEAR GALLIPOLIS, OHIO; I5Y DR. 

 S. P. HILDRETH. 



About two miles above Gallipolis, and half a mile from the Ohio 

 river, is the location of several petrified trees. They are found 

 near the base of a mural |)recipice of sandstone rock, 50 feet in 

 height, and crowned with earth and trees to an elevation of 70 feet. 



I'rom 



