S2 Scientific Intelligence. 



lar, has more than once insisted upon his own obligations to his 

 friend for advice and suggestions ; and though the correspond- 

 ence between these two great men is not included in the present 

 volumes, one is glad to learn from the preface that the letters on 

 both sides have been preserved and will be published separately 

 as " a memorial of the life-long friendship and collaboration of 

 the authors." 



Besides the scientific correspondence there are letters of bio- 

 graphical interest, and the first volume begins with an admirable 

 chapter of personal "Notes and Recollections" of Sir George 

 Stokes by his daughter, Mrs. Humphry. A useful index is 

 appended to each volume. h. a. b. 



6. JElektrische Fernphotographie unci Ahnliches ; von Arthur 

 Korn. Pp. 87, with 21 figures and 1 table. Zweite Aufiage. 

 Leipzig, 1907 (S. Hirzel). — This second edition follows the first 

 issue after an interval of some three years. The subject with 

 which it deals is one in which so much active work has been and 

 is still being done that in many respects, especially from the 

 practical side, the situation is materially changed. The author, 

 who has already presented the prominent advances in wireless 

 telegraphy in recent numbers of the Physikalische Zeitschrift, 

 now gives them to a wider public in this volume. Although 

 brief in extent, the subject is clearly and adequately presented. 



II. Geology. 



1. United States Geological Survey. — Recent publications of 

 the U. S. Geological Survey are included in the following list 

 (continued from vol. xxiii, p. 226) : 



Topographic Atlas. One hundred and forty folio sheets. 



Mineral Resources of the United States : Calendar Year 

 1905. David T. Day, Chief of Division of Mining and Mineral 

 Resources. Pp. 1403, with one figure. — This is the twenty-second 

 volume of this valuable series ; many of the chapters have already 

 been placed in the hands of the public as separate pamphlets. 



Professional Papers, No. 57. Geology of Marysville Mining 

 District, Montana : A Study of Igneous Intrusion and Contact 

 Metamorphism ; by Joseph Barrell. Pp. x, 178, with 16 plates 

 (two in cover) and 9 figures. — See p. 85. 



Bulletins, No. 279. Economic Geology of the Kittanning 

 and Rural Valley Quadrangles, Pennsylvania ; by Charles 

 Butts. Pp. 198, with 11 plates and 14 figures. 



No. 286. Economic Geology of the Beaver Quadrangle, Penn- 

 sylvania (Southern Beaver and Northwestern Allegheny Coun- 

 ties) ; by Lester H. Woolsey. Pp. 132, with 8 plates and 35 

 figures. 



No. 287. The Juneau Gold Belt, Alaska ; by Arthur C. 

 Spencer : and A Reconnaissance of Admiralty Island, Alaska, by 

 Charles Will Wright. Pp. xii, 161, with 37 plates and 41 figures. 



No. 294. Zinc and Lead Deposits of the Upper Mississippi 

 Valley; by H. Foster Bain. Pp. xi, 155, with 16 plates and 45 

 figures. 



