82 Scientific Intelligence. 



divided into two parts ; to one is added a slight excess of ammo- 

 nium bicarbonate solution, and to the other an equal quantity of 

 water. If the turbidity is due to silver chloride, it will dissolve 

 in a few moments, but if it is due to the bromide it will remain 

 undissolved for several minutes, if not for an hour or more. — 

 Chem. News, lxxxix, 129. h. l. w. 



4. Solubility of Silicon in Zinc and Lead. — Moissan and 

 Siemens have found that silicon dissolves in zinc at a much lower 

 temperature than in lead. In zinc the solubility begins at 550°, 

 and amounts to 1*6 per cent at 850°. In the case of lead the 

 solubility begins at 1100°, and at 1400° it amounts to only 0*15 

 per cent, while at the boiling-point of lead, about 1550°, it 

 amounts to only about 0'79 per cent. — JBerichte, xxxvii, 2086. 



H. L. W. 



5. Analytical Chemistry, Volume IT, Quantitative Analysis; 

 by F. P. Tkeadwell : translated from the Second German 

 Edition by William F. Hall. 8vo, pp. 654, with 96 figures. 

 New York, 1904. (John Wiley & Sons, price $4.00.) — A satis- 

 factory text-book for students in quantitative analysis has long 

 been needed, and it appears that the work under consideration 

 will fill this want admirably, and that it will be a most useful 

 book of reference for practical analysts. The most modern and 

 satisfactory methods of analysis are ably presented, and the book 

 is not encumbered with antiquated and superseded processes. 

 The best electrolytic methods are included, as well as methods of 

 fire assaying for gold and silver ores, while separate parts of the 

 book give excellent treatises on volumetric analysis and gas 

 analysis. The modern aspect of the work will be evident when 

 it is stated that the use of the Gooch crucible is strongly advo- 

 cated (although the details given for its use appear to be unduly 

 complicated, probably from lack of experience with the proper 

 kind of asbestos), and also from the fact that many other Ameri- 

 can methods, such as those of Gooch and his pupils, Hillebrand, 

 and others, are given. This attitude towards American improve- 

 ments is in agreeable contrast with the usual conservatism dis- 

 played in this respect by European works on analytical chemis- 

 try. The translator has also helped in this direction by making 

 certain additions and changes with the object of rendering the 

 book more useful to English-speaking students. h. l. w. 



6. Laboratory Exercises in Physical Chemistry ; by F. H. 

 Getman. 12 mo, pp. 241. New York, 1904. (Wiley & Sons.) — 

 There has been previously no suitable laboratory text-book in phys- 

 ico-chemical measurements which could be used by the average 

 student, and the present volume has been written to meet this 

 requirement. The customary measurements in physical chemis- 

 try are well described in detail, with the apparatus required^ 

 Usually but one method is given for each measurement. We 

 notice that in describing the boiling-point apparatus only the 

 Jones form is described, while no mention is made of the Beck- 

 mann form. There is a set of convenient tables added at the 

 end of the book. h. w. f. 



