Notices respecting New Boohs. 461 



I have found it impossible, unaided, to cany out a suffi- 

 ciently complete series of observations to get the diurnal curve 

 during these times of land wind ; but the accompanying dia- 

 gram may be taken as a first approximation to it between the 



Hours 



hours of 6 A.M. and 11 p.m. It is prepared from the observa- 

 tions of September 1883 and August and September 1884. 

 Madras, July 16, 1885. 



LV. Notices respecting New Books. 



Handbook of Technical Gas -analysis, containing concise Instructions 

 for carrying out Gas -analytical Methods of Proved Utility, By 

 Clemens Wiistckler, Ph.D., Professor of Chemistry at the Frei- 

 burg Mining Academy. Translated, with a few additions, by 

 George Lunge, Ph.D., Professor of Technical Chemistry at the 

 Federal Polytechnic School, Zurich. Van Voorst. London. 

 rPO those who have, during the last eight or ten years, been under 

 -■- the necessity of analyzing the gaseous mixtures from the flues 

 of regenerative furnaces, and there are many such persons in this 

 country, the name of Dr. Winckler is favourably known as being 

 one of the first so to simplify the operations as to render it un- 

 necessary to employ the methods of Bunsen and Eegnault. The 

 translator is, we think, scarcely aware of the extent to which tech- 

 nical gas-analysis is cultivated in England ; for, in his preface, he 

 says that " it is now quite usual, at any rate in Germany, to perform 

 technical gas-analysis, not merely in chemical works, but for testing 

 the efficiency of steam-boiler furnaces and such purposes. In 

 England some of these processes have also been introduced ; but 

 they are not as yet known and appreciated to the same extent 

 as abroad." It would of course be difficult, if not impossible, to 

 compare the actual number of analyses made in the two countries ; 

 but we have no hesitation in saying that Dr. Bunte's process, at all 



