256 Scientific Intelligence. 
¢ A 1° C,; 
armontite, 22.0.5 6. fescue es Seve ay bes et ceases) BSB). PTL os ogy ‘ 
rsenious acid (artificial), 12378 | 20°37 | ...... 
Spinel (regular system, hence a=a’=2’’), ,,..........-. vemger 
7. 3 Pot Ceylon, oc vise ee bcsa revi ckiceincees TiSt Tt F291 eee 
2. Pleonast from Warwick, 1805} 6°34 | vavess 
3. Gahnite from Fahlun, 1766 |) 6°19 Js, oe 
4. Kreittonite from Silberberg, 1750 | 5°31 | écccee 
It is evident that ¢ is found by c—At=0; it thus appears that the 
maximum of density instead of being an exception may be the rule! 
Fizeau has cut a needle of beryl wherewith he proposes to verify it.— 
Poggendorf’s Annalen, 1866, cxxviii, 564-589. : 
. Expansion of a conductor due to the galvanic current; by Er. 
Epiunp (Swedish Academy, January, 1866).—When a current passes 
through a conductor, the latter is heated to a certain temperature, ¢, 
aed T,, which would correspond to the above resistance R—that is, 
e 
Il. MINERALOGY AND GEOLOGY. 
1, Wote on the use of the name Hudson-river group: by F. B. MEEK 
—In the Introduction to the Illinois Paleontology, just published, Mr. 
mark i 
