345 
Grafe, V., (Kl. Arb. d. pflanzenphys. Inst. d. Wiener Univ. Oest. 
bot. Ztschr., v. 56, pp. 289-291) outlines a new reaction for for- 
maldehyde, in which a solution of diphenylamin (1 per cent) in con- 
centrated sulphuric acid is superposed by the liquid to be tested. 
With dilute aqueous solutions of formaldehyde there is formed a 
white precipitate and at the point of contact an emerald green col- 
oration. Other aldehydes produce other and evanescent colors. — 
Bot. Centralbl., Cassel, 1906, v. 102, p. 599. 
Leys, Alexander, asserts that acetaldehyde, in aqueous solutions, 
does not react with mercuric oxide alone, but does react in the pres- 
ence of sodium chloride or of sodium sulphite, producing a precipi- 
tate that is insoluble in water or in alcohol. Formaldehyde, fur- 
furol, and certain aromatic aldehydes do not react in the same way. 
(From J. de pharm. et de chim.) — Pharm. Zentralh., 1906, v. 47, 
p. 633. 
An answer to a correspondent outlines the Hehner, Pilhashy, and 
Rimini tests for formaldeh} 7 de. — Merck’s Kept., N. Y., 1906, v. 15, 
p. 115. 
Bigelow, W. D., outlines the provisional methods for the determi- 
nation of formaldehyde that have been adopted by the Association of 
Official Agricultural Chemists. — Circ. Bur. Chem., U. S. Dept. Agric., 
1906, No. 28, pp. 8-10. 
Schoorl, N., discusses the several methods for determining the free 
formic aldehyde in solutions of formaldehyde, and outlines a method 
depending on the oxidation of formaldehyde by means of solution of 
hydrogen dioxide in the presence of an alkali and titrating the re- 
sidual alkali with normal acid, using phenolphthalein as an indi- 
cator. (From Pharm. Weekbk, 1906.) — Apoth. Ztg., Berl., 1906, v. 
21, p. 986. 
Wiebelitz, H., recommends the method proposed by Yanino for the 
determination of the formaldehyde content of the solution of formal- 
dehyde. — Pharm. Ztg., Berl., 1906, v. 51, p. 1003. 
Grossmann and Aufrecht discuss the titrimetric estimation of 
formic aldehyde and of formic acid by means of potassium perman- 
ganate in acid solution. (Ber. d. Chem. Ges., 1906, v. 39, p. 2455.) — 
Biochem. Centralbl., Leipz., 1906-7, v. 5, p. 652. 
Bergell points out that in practice, where a number of formalde- 
hyde titrations are to be made daily, the sulphite method will be 
found to be much more practicable, giving good results with a mini- 
mum expenditure of time. — -Ibid ., v. 5, p. 652. 
Blank and Finkbeiner outline a method for the determination of 
methyl alcohol, in solutions of formaldehyde, by means of chromic 
acid. — Ber. d. deutsch. chem. Gesellsch., Berl., 1906, v. 39, pp. 1326- 
1327. 
