J, M. Ordway on Waterglass. 157 
On it can be only superficial and therefore must be exceedingly 
slow. In the saenting of ores, for instance, the metallurgist has 
Knapp’s Technology, —Am. Ed..—ii, 398. 
‘is i e agner’s Jabroideniahee iiber dié Fortschritte der Chemisches Technologie,— 
$ See this Journal [2], vi, p. 260-266. ~ 
