

Geology and Mineralogy. 573 



9. The Electrical Nature of Matter and Radioactivity ; by 

 Harry C. Jones. Second edition. Svo, pp. 210. New York, 

 1910 (D. Van Nostrand Co.).— The first edition of this work 

 appeared five years ago (see vol. xxi, p. 465), and many advances 

 have been made in our knowledge of the subject during the inter- 

 vening period. It is, therefore, difficult to conceal the disap- 

 pointment one feels on finding much of the older and now 

 superseded data of the earlier edition still in evidence, and espe- 

 cially so as one is led to believe from the title page and preface 

 that a general revision of the subject matter has been carried out 

 in the preparation of the present edition. The style of the writer 

 is lucid, and his talent for the exposition of simple facts is par- 

 ticularly noticeable 7 in many instances. It is unfortunate, there- 

 fore, that the value of the book as an elementary treatise should 

 be somewhat impaired through what appeal's to be a certain lack 

 of familiarity with the subject on the part of the author, b. b. b. 



II. Geology and Mineralogy. 



1. Illinois State Geological Survey, Bulletin No. 16, Year- 

 book for 1909. Frank W. DeWolf, Acting Director. Pp. 

 402; 37 plates, 9 figures, map in pocket. ijrbana, 1910. — 

 The reports of the Illinois Survey contain year by year the record 

 of an unusual amount of work of a varied character, and indicate 

 the advantages to be gained by cooperation between the Federal 

 and State organizations engaged in mapping, geologic work, 

 reclamation surveys, and investigations of soil and water supply. 

 The Survey has a generous appropriation, and the published 

 results amply justify the expense. The Year-book for 1909 con- 

 tains the following chapters, some of which have been separately 

 published : Administrative Report ; Elizabeth sheet of the lead 

 and zinc district, by G. H. Cox ; Oil Resources of Illinois, by R. 

 S. Blatchley; Studies of Illinois Coal, by F. W. DeWolf, A. 

 Bement, S. W. Parr, G. H. Cady, T. E. Savage, E. W. Shaw, R. 

 G. Williams, Jon Udden ; Faunal Succession and Correlation of 

 the Pre-Devonian formations of Southern Illinois, by T. E. Sav- 

 age ; The Occurrence of Structural Materials in Illinois, by Jon 

 Udden and J. E. Todd. h. e. g. 



2. New Zealand Geological Survey. A Geographical Report 

 on. the Franz Josef Glacier ; by J. M, Bell. With Topograph- 

 ical Maps and Data by R. O. Greville, and Botanical Notes by 

 Leonard Cockayne. Pp. 14; 3 maps, 6 photographs. Welling- 

 ton, 1910 (John Mackay). — Geographers are indebted to Dr. Bell 

 for the first detailed report on one member of the interesting group 

 of glaciers which occupy valleys in the Southern Alps of New Zea- 

 land,— a series of glaciers unusually large in proportion to the 

 height of the range and to latitude. The Franz Josef glacier is 

 *l\ miles long, has a width at its terminus of 41 chains, while the 

 snowfield at its head covers 4,758 acres. Owing to factors which 



