Technical Chemistry. 267 
acids; and it must be remembered that what is dull white in silver, ap- 
pears gray in platinum. 
each commencement of this loosening is again destroyed, the eruci- 
scope, no grain of it should exhibit sharp edges or corners, all the angles 
should be obtuse.— Journ, Sir praktische Chemie, March, 1860, Ixxix, 117, 
readily even the most practical matters may fall into oblivion in spite of 
the copiousness and the vigilance of our literature. F ifteen years ago, 
Prof. Siller, at that time filling the chair of Pharmacy at Dorpat, called 
ashes about an inch in thickness, and sand then heaped up all around it; 
the distillation may then be proceeded with, without any further precau- 
tions, By this method I have twice rectified sulphuric acid, operating 
With a very bad retort, upon portions of 15 lbs weight; and have been 
boil only from the sides of the retort. Since then, manifold expedients 
ve Seen proposed, all depending upon some peculiar apparatus, con- 
structed for this particular purpose, but I have not yet met with any og 
erence to the simple contrivance which has here been mentioned. _ 
From Archiv der Pharmacie, exly, 267; in polytechnisches Notizblatt, 
1860, xv, 48, 
[Preoernre of Riga, (Archiv d. Pharm., Aug., 1859; in American 
Journal of Pharmacy, viii, 88,) corroborating the statement of Neese, 
Males that he can recommend the process from his own experience, 
vihea is evi 1 devices almost as simple as the 
Wish he ducribes hard poesreTy fea eed Put Oe Gai Leebon 
der Thorganischen Chemie, Braunschweig. 1855, i, 275,) directs that the retort be 
eg i rucible 
val fire which is built around it however, considers it n ef 
the retort with a thin cuating of clay which has been mixed with a dilute solution of 
© of tof borax, instead of water, so that it may adhe oie 
Poa when ; urging that the danger of fracturing the latter is not « } 
aati thereby, but that a more rapid distillation is insured, since little or He = en- 
Propet occur within a retort thus prot pelyndd an r 
49; 
“Wer, the retort is not coated ) 
Possibly @ more convenient method than either of the above would be to fill a suf: 
r ‘ gypsum, for chitiisaiciein' tend upon which to rest the bottum of the retort, 
eval fire similar to Otto's being then builf around it. F. H. S. 
