CONTENTS TO YOLUME XXXIX. 



Number 229. 



Page 



Aet. I.— The Ternary System CaO-Al,0 -SiO a ; by G. A. 



Rankin. With Optical Study by Fred E. Weight. _ 1 



II. — New Meteoric Iron from Sams Valley, Oregon ; by 



W. M. Foote _ _ . 80 



III. — New Longirostral Mastodon, Tetrabelodon lulli. Pre- 

 liminary Notice ; by E. H. Barboue 87 



IV. — Repulsion of Two Metallic Disks, nearly in Contact ; 



by C. Baeus _ . _ . 93 



V. — Lawsonite from the Central Coast Ranges of California ; 



b} r A. F. Rogees _ _ . 105 



VI. — Preparation and Hydrotysis of Ethyl Hydracrylate ; 



by W. A. Deushel _. 113 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Coal Tar Chemical Industry, B. C. Hesse, 121. — 

 Freezing-Point of Milk, Henderson and Meston : Chemical Technology 

 and Analysis of Oils, Fats and Waxes, J. Lewkowitsch, 122. — Laboratory 

 Manual of Qualitative Chemical Analysis, A. E. Bliss, Jr. : -Absorption 

 and Eesonance of Helium, F. Paschen, 123. — Intermittent Vision, S. P. 

 Thompson : Bausteine zur Flugbahn- mid Kreisel-Theorie, A. Dahne, 

 125.— Text Book on Wireless Telegraphy, E. Stanley, 126. — Principles 

 of Electrical Measurements, A. W. Smith : Geometry of Four Dimensions, 

 H. P. Manning, 127.— Experiments, P. E. Edelman, 128. 



Geology and Mineralogy— Transportation of Debris by running Water, G. K. 

 Gilbert, 128. — Mississippian Brachiopoda of the Mississippi Valley Basin, 

 S. Weller, 129. — Anticosti Island faunas, W. H. Twenhofel : British 

 Carboniferous Producti, I. Genera Postula and Overtonia, I. Thomas, 130. 

 — Palaeontologische Zeitschrift : Topographic and Geologic Survey Com- 

 mission of Pennsylvania, 131. — Geological Survey of New Jersey: Iowa 

 Geological Survey : Wisconsin Geological and Natural History Survey : 

 College Physiography, E. S. Tarr and L. Martin, 132. — Deposits of the 

 Useful Minerals and Rocks, 133. — Practical Instruction in the Search for 

 and Determination of the Useful Minerals, A. McLeod : Origin of Thau- 

 masite, F. I. Allen, 134. 



Miscellaneous Scientific Intelligence — National Academy of Sciences, 135. — 

 Study of Foods, R A. Wardall and E. N. White : Source, Chemistry and 

 Use of Food Products. E. H. S. Bailey : Food Industries, H. T. Vulte 

 and S. B. Vanderbilt, 136. 



