126 Scientific Intelligence. 
which is allowed to rest on the plate for a minute and then drained ¢ 
when the developer is applied. Two solutions are prepared. if 
0. 1. Pyrogallic acid, - - - - - 1 gram. 
Water, So Hota wy Rael 
Glacial acetic acid, - - - - 25 
cono. - - - - 
No. 2. Saturated solution of gallic acid in pure water. 
The developer consists of 5 grams of No. 1, mixed with 15 g 
; ARD Rutey, F.C.S.'—The presence of small cubical red crysta 
with a metallie lustre, has long been observed in the hearths of 
: 
blast furnaces—they may be said, in fact, to be universally pr 
to a grea t less extent—occur most largely in the hearths 
furnaces where clay iron-stone, or siliceous iron ores (su 
r. 
mercial reputation for its quality, and, as a rule, the better the quality’ 
iron made in a blast-furnace the more titan; < 
ntity. 
The red crystals were first supposed by Wollaston to be titanium} 
Wobler has subsequently shown them = be a mixture of a nitrid | 
* Read before the British Association at Newcastle, and extracted from 
London Chemical News, Nos, 20g and 207, Nov. 7 and 14, 1863. 
