THE 



GEOLOGICAL MAGAZINE 



VOLUME LVII. 



No. VIL— JULY, 1920. 



EDITORIAL notes: 



JUL2 11920 



/^WING to pressure of original articles our Editorial Notes are 

 ^^ this month, considerably reduced in length. 



>[: ^ ^ ^ ^ ^ :{! 



The class list for the Second Part of the Natural Sciences 

 Tripos, Cambridge, contains the names of two geologists who 

 attained a first class : E. W. Ravenshear, M.C., M.A., Clare, and 

 W. A. Macfadyen, B.A., St. John's. We believe these two gentlemen 

 were the only geological candidates in the second part of the Tripos 

 this year. The Harkness Scholarship is awarded to Mr. Ravenshear. 



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Monsieur A. Lacroix, Member of the Institute and Professor of 

 Mineralogy at the National Museum for Natural History, Paris, 

 gave during the month of June four lectures at the Imperial College 

 of Science (Royal School of Mines), South Kensington. The title 

 of the course was announced as "Divers Modes de Dynamisme des 

 Eruptions Volcaniques : Phenomenes de Lateritization ". The 

 lectures were delivered in French, and illustrated by numerous 

 lantern slides. Sir Jethro J. H. Teall took the chair, and the course 

 was attended by a considerable audience of petrologists and advanced 

 students of geology. 



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We have received a copy of an interesting paper read by Dr. A. W. 

 Rogers, F.R.S., to the Chemical, Metallurgical, and Mining Society 

 of South Africa on the identification of the mineral character of 

 particles in mine dust by the application of petrological methods. 

 By an ingenious application of the well-known Becke bright-line 

 method Dr. Rogers has been able to identify particles of quartz 

 down to less than one micron in diameter. The importance of this 

 is obvious, in view of the injurious properties of quartz dust in the 

 air breathed by miners. In the discussion on this paper one speaker 

 expressed surprise that any practical result should have followed 

 consultation with a geologist. Now the fact is that geology is such 

 a wide subject and deals with so many sides of science that there are 

 few matters of a physical kind on which a geologist has not some- 

 thing to say, generally very much to the point. This was abundantly 

 proved during the War. 



VOL. LVII. — NO. VII. 19 



