306 Scientific Intelligence. 



the theory. The arguments in favor of the theory appear very 

 strong, and whatever may be the outcome in regard to its general 

 acceptance, it is certain that a valuable and important mass of 

 facts has been accumulated in these extensive investigations. 



II. l. w. 

 5. Die Entvricldungsgcschichte der Chemie; von A. Ladejst- 

 bueg. 8vo, pp. 417. Braunschweig, 1907 (Friedrich Vieweg 

 und Sohn). — This is the fourth edition of the well-known lectures 

 on the history of the development of chemistry from the time of 

 Lavoisier to the present. The first edition appeared thirty eight 

 years ago, in 1869. At that time the great chemists Liebig, 

 Wohler, Bunsen, Kolbe, Kekule, Dumas, Wurtz, Frankland, and 

 Williamson were living, some of whom had been the author's 

 teachers, and all of whom he knew personally. This circum- 

 stance gives to the book a great degree of authority in regard to 

 the early history of chemistry. To the original fourteen lectures 

 a new one has been added with each new edition, to bring the 

 history up to the time of writing, so that the present enlarged 

 and improved edition comprises seventeen lectures or chapters. 

 The book deals largely with the development of chemical theo- 

 ries. The copious references to the literature are an important 

 and useful feature of the work. h. l. w. 



II. Geology and Mineralogy. 



1. Geological Survey of Canada; Robert Bell, Acting 

 Deputy Head and Director. Summary Report for the Calendar 

 Year 1905. Pp. 144, with 3 colored maps. Summary Report 

 for the Calendar Year 1906. Pp. 206. Section of Mines: 

 Annual Report for 1904. Pp. 162. — The Summary Reports for 

 1905 and 1906 have been recently received with also the Report 

 of the Section of Mines for 1904. The reports are very largely 

 given to economic developments, for which the demand is now 

 greater than ever. The Director calls attention to the fact that 

 during the twenty years since 1886 the minei*al production of 

 Canada has increased about seven times, or from $10,000,000 to 

 nearly $70,000,000. At the same time the appropriations, both 

 for the Geological Survey and the Mines Branch of the Depart- 

 ment of the Intei'ior, have only increased from $115,000 to 

 $174,000. Considering the very wide extent of country to be 

 examined from the Provinces on the Atlantic to British Colum- 

 bia and Alaska on the Pacific, it is evident that any adequate 

 development, such as the best interests of the country call for, 

 demands a much larger force than is possible with the present 

 limited -support. It is also obvious that the economic work, 

 important as it is, should not* crowd out that more strictly 

 belonging to pure geology. 



