REVIEWS 



Description geometrique des Alpes Frangaises, Annexe du Tome 

 second. By P. Helbronner. Six panoramas . dessines et 

 peints par I'auteur, 23 planches dans un carton in-folio. Paris: 

 Gauthier-Villars, 192 1. 

 Gauthiers-Villars of Paris have, in this portfoHo, put on the market 

 colored panoramas of the French Alps which for both accuracy and 

 beauty excel anything which has hitherto been produced. These pano- 

 ramas have been drawn and colored as aquarelles by Paul Helbronner 

 upon the basis of a trigonometric survey which this accompHshed map- 

 maker, Alpinist, and artist has made. In the course of this work, he 

 found it necessary to ascend with his instruments all the high and diffi- 

 cult peaks of the region. In all, the panoramas consist of twenty-three 

 plates in color joined in six groups. The largest of the panoramas is 

 a complete tour of the horizon from the summit of Mont Blanc and 

 consists of thirteen plates making a picture 19 ft. 6 in. in length. Two 

 others — Mont Blanc from the Mont-Maudit and Mont Blanc from the 

 Col du Geant — consist each of three plates of the same size as the 

 others. Under each of the panoramas is an outline-drawing from which 

 each peak may be identified. The coloring of these remarkable panora- 

 mas is superb while faithful to nature, as will be testified to by anyone 

 who has climbed in these regions. The publication of the portfolio 

 marks an epoch in the history of reproduction in color. The panoramas 

 are all well suited for framing. 



W. H. HOBBS 



Coal. By Elwood S. Moore. New York: John Wiley & Sons, 

 March, 1922. 



This is primarily a volume for the mining student and the engineer 

 who is in charge of coal-mining operations, but it should also be of inter- 

 est to every geologist. It brings together the best of a varied Hterature 

 and places it at the disposal of all in usable form. 



Neither time nor space is wasted in the introductory chapter. From 

 a brief history of the subject the author starts out energetically to discuss 

 the megascopic and microscopic properties of coal and then passes 

 naturally into a discussion of its chemical composition. The best and 

 latest methods of sampling are given in sufficient detail to enable a man 



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