Chemistry and Physics. 113 
@ second instance, in very distinct crystals occupying little clefts, 
the crystals being implanted on massive or simply foliated dias- 
the other at Trumbull with topaz and fluor. 
6. Dinyre at Canaan, Conn.—Mr. F. E. Seymour of New York 
gave me for examination an unknown mineral which I find to 
be dipyre. It occurs in small crystals disseminated through a 
edges deeply truncated, so as to possess very nearly equal breadth 
with the primary planes, to which they incline under angles of 
135° (reflec, goniom.). Hardness =6. Gravity =2°6. Semi- 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND PHYSICS. 
1. On the chemical constitution of the brain—Liesretcn has discov- 
ered in the fresh brain of man and animals a crystalline substance to 
which he has given the name of protagon (from zgqutayov), The brain. 
of an animal is most conveniently obtained free from blood by oubting 
the s from 
