50 Editorial Notes. 



The Thirteenth Session of the International Geological Congress, 

 long postponed owing to the war, will be held in Brussels from 

 10th to 19th August next. During this period papers will be read 

 and discussed and there will be short excursions in the neighbour- 

 hood. Both before and after the formal session long excursions 

 will be conducted by eminent Belgian geologists to all points of 

 geological interest in the country. Some of these will cover much 

 the same ground as visited by the Geologists' Association last 

 summer, but there are many others of great attractiveness. 

 Full particulars can be obtained from the General Secretary, 

 M. A. Eenier, Palais du Cinquantenaire, Bruxelles. 



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Owing to the Christmas holidays the proofs of our January 

 number had to be corrected very hastily : a .slight error, owing to 

 the omission of three words, unfortunately occurred in a review of 

 the Bulletin on the Eocks of Essex County, Mass. (p. 45). The 

 first sentence of the second paragraph should have read as follows : 

 " The calc-alkali series ranges from granodiorite (68'94 per cent 

 SiOa) to gabbro-diorite and hornblende- gabbro f46"B2 per cent 

 Si02), etc." The latter figure was obviously too low for a gabbro- 

 diorite. 



