92 Scientific Intelligence. 



ous kinds of apparatus which are virtually toys in their simplicity 

 but illustrate in an interesting way many fundamental physical 

 principles. Elementarj^ science teachers should find this a val- 

 uable source book for the preparation of their lessons. 



F. E. B. 



11, Annuaire pour VAn 1920; pp. VIII, 708, Appendices 

 A.27, B.64, C.70. Paris 1920 (Gauthier-Villars et Cie.).— This 

 annual publication of the Bureau des Longitudes has appeared 

 without interruption since 1796. In all volumes of the series the 

 material is arranged under five grand divisions with the following 

 captions : The Calendar, The Earth, Astronomy, Weights and 

 Measures. The fifth division alternates between two headings. 

 In the even years it includes Physical and Chemical data and in 

 the odd years it is devoted to geographical statistics and tables of 

 annuities, of interest, and of the expectation of life. 



Chapters 1 and 3 contain extended ephemerides of the sun, 

 moon, planets and stars for the meridian of Paris, tide tables, and 

 a discussion of various calendars. A complete almanach for 

 1921 is added in a supplement. Chapter 2 shows the form, 

 dimensions and density of the earth, together with tables of the 

 acceleration of weight and the constants of terrestrial magnetism. 

 Chapter 4 exhibits the various systems of weights and measures 

 in their relation to the metric system, and the monetary systems 

 of the world. Chapter 5 supplies a great variety of physical and 

 chemical constants which cannot be briefly summarized. The 

 leading tables deal with density, expansion, wave lengths, heats 

 of combination and atomic weights. 



Appendix A is an article on the prediction of swell, that is, 

 the propagation of waves which persist after the wind has fallen. 

 Appendix B discusses a new system of legal units. Appendix C 

 contains a carefully arranged index which also carries references 

 to the most important tables published in the five preceding 

 volumes. 



This book cannot fail to be a valuable addition to any reference 

 library. " f. e. b. 



II. Geology. 



1. Der Siidrand der Puna de Atacama (NW-Argentinien) . 

 Ein Beitrag zur Kenntniss des Andinen Gehirgstypus iind zu der 

 Frage der Gehirgshildung ; von Prof. Dr. Walther Penck, 

 Abhandl. Sachs. Akad. Wiss. math-phys. Klasse, 37, 1920, 420 

 pages, with a bibliography of 148 titles, 33 small but excellent 

 photographs on 9 plates, 18 cross-sections, and a large folded 

 map, 1 :200,000, covering an area of 100 by 125 kil. with sketched 

 contours at 100-meter intervals and geological colors distinguish- 

 ing 52 formations. — The young author of this study, the son of 

 Prof. Albr. Penck of Berlin, has won his spurs by painstaking 

 exploration in northwestern Argentina as assistant on the geolog- 



