60 
Collins, S. H., discusses the inaccuracies of Sclieibler’s apparatus 
for the determination of carbonic acid in carbonates and describes 
and figures a modification, giving half a dozen tables showing his 
results. — J. Soc. Chem. Ind., Lond., 1906, v. 25, pp. 518-522. 
Perman, Edgar Philip (Chem. News, May 11, 1906, 213), over- 
comes the difficulty met with in estimating chlorine, ammonia, and 
other substances, in which an absorption tube is used, by the use of 
a modified tube, illustrated in connection with the abstract. — Proc. 
Am. Pharm. Ass., 1906, v. 51, p. 608. 
Wilson, J. Beetham, describes and illustrates a modified Soxlilet 
tube which has been devised to facilitate the removal of the last trace 
of the solvent without necessitating the taking apart of the appara- 
tus. — Pharm. J., Lonch, 1906, v. 22, p. 587. 
Ludecke, K. (Pharm. Ztg.), describes a reflux condenser which 
combines the advantage of compactness with a large cooling surface. 
Condensation is effected both by the surrounding air and by the cir- 
CD 
dilation of water through an interior tube. The condenser perfectly 
replaces Liebig’s condensers. — Proc. Am. Pharm. Ass., 1906, v. 51, 
pp. 603-601. 
Glatzel, C. (Apoth. Ztg., 1906, v. 21, 323), describes a condenser 
which differs from the ordinary form by providing a double cooling 
surface. This construction secures the effective condensation of 
highly volatile fluids, and is particularly useful for reflux condensers 
in extracting operations. — Ibid ., v. 51, pp. 602-603. 
Rogers, Allen, describes and figures an apparatus which has given 
him excellent results in the analysis of such substances as tea, coffee, 
tannin, and so on, where an aqueous infusion is necessary. — J. Am. 
Chem. Soc., 1906, v. 28, pp. 191-196. 
Bang, I., discusses the application of the centrifuge for quantita- 
tive analysis, particularly of urine. — Biochem. Centralbl., Leipz., 
1906-7, v. 5, p. 651. 
Brandel and Kremers present an exhaustive review of the balance, 
describe balances of various kinds, and illustrate the different parts 
and their modifications. — Pharm. Rev., Milwaukee, 1906, v. 21, 
pp. 19-60, 75-82, 105-111, 151-151, 166-171. 
12. FILTERS. 
Labat, A., reviews the observations published relating to the ele- 
ment of error caused by filter paper in chemical analysis. — Bull. Soc. 
cle pharm. cle Bordeaux, 1906, v. 16, pp. 195-200. 
Dunning, H. A. B., recommends the use of powdered paper as a 
filtering medium, as a clarifying agent for a variety of purposes, or 
as a diluent in the percolation of substances, such as cudbear, which 
have a tendency to clog in percolating. — Proc. Am. Pharm. Ass., 
1906, v. 51, p. 181. 
