REVIEWS 103 



9. Significance of the Drainage Changes near Granville, Ohio, by Earl 

 R. Scheilel. 



10. Age of the Licking Narrows, by K. F. Mather. R. T. C. 



College Geology. By Thomas C. Chamberlin and Rollin D. 

 Salisbury. Pp. 978, with 21 plates and 608 text figures. New 

 York: Henry Holt and Co., 1909. 



This book is essentially an abbreviation of the author's three-volume 

 Geology, which appeared in 1904-6, with some changes of matter and mode 

 of treatment and with many new illustrations. R. T. C. 



Experimentalunfersuchungen iiber die auscheidungsjolge von silikaten 

 bei zwei und drei componenten. By R. Freis. Neues Jahrbuch 

 fiir Mineralogie. Beilage, Band XXHI, 1907. 47 pp., 13 figs., 

 3 pis. 



Freis gives the results of his studies on the freezing and melting curves, 

 differentiation phenomena, and the sequence of crystallization of the follow- 

 ing components: 



I. Diopside and anorthite. 

 II. Diopside and olivine. 



III. Diopside and nepheline. 



IV. Diopside, anorthite, and magnetite. 



V. Diopside, olivine, and magnetite. 



VI. Diopside, olivine, and anorthite. 

 VII. Diopside, olivine, and nepheline. 



VIII. Diopside, olivine, and orthoclase. 



Various proportions of the chemically pure mineral constituents were 

 melted, and cooled to glass. These glasses were heated in the electric 

 furnace and the following temperatures noted: 



Tj. The mass softens and takes slight impressions. 



Tj. The mass has become entirely liquid. 



T,. Initial freezing point. 



T4. Freezing completed. 



The freezing and melting curves descend to a minimum, lying between 

 the two extremes of composition in the two component systems, indicating 

 the presence of eutectics. Eutectics were also observed in nearly all the 

 three component systems. Undercooling was a marked characteristic of 

 all the freezing curves. 



