Notices of Books and Papers. 55 



2nd That all certified members of the Society in good 

 standing may become Associate members of the Natural 

 Histoiy Society with the usual privileges of access to their 

 library, museum, etc., on payment by such members to that 

 Society of fifty cents annually. This in addition to the 

 regular fee of fifty cents payable to the Agassiz Society 

 itself. 



It was understood by this committee in carrying out its 

 negotiations for these affiliations that the object aimed at 

 was not in any way to improve the financial position of one 

 society at the expense of another, but to bring the workers 

 in the various branches of Natural History in Montreal into 

 closer contact, thus strengthening all the societies and 

 making their work more efficient. 



It is hoped as a result of these affiliations, if they be 

 carried out, that early next autumn a list, giving the dates 

 of meeting of all the branches of the Natural History 

 Society, for three or possibly six months in advance, may 

 be issued, together with the titles of the papers to be read 

 at the several meetings. Also that once or twice during 

 the winter these branches may hold a meeting on a date 

 appointed for one of the regular monthly meetings of the 

 Natural History Society, such joint meetings being devoted 

 to the consideration of such subjects as these several 

 branches shall determine. 



Notices of Books and Papers. 



Lehrbuch der Petrographie von Dr. Ferdinand Zirkel 

 — Zweite ganzlich neu verpasste Auflage — Brster 

 Band — Wilhelm Engh^man, Leipzig, 1893. 



The appearance of the first volume of the new edition of Prof. 

 Zirkel's Text- Book of Petrography will be most heartily welcomed 

 by all students of this science. The first edition of the work 

 appeared in 1866, Prof. Zirkel being one of the earliest workers in 

 modern petrography, and since that time principally owing to the 

 introduction of the microscope into petrographical work, the science 

 has grown so enormously and its literature has become so exten- 



