10 THE CANADIAN NATURALIST. [March 



or some other silicate. Both Dawson and Carpenter, however, it 

 will be recollected, found that in the fragmentary Eozoon from 

 Madoc, and in some small portions from Grenville, the injected 

 mimpral was, like the shell itself, pure carbonate of lime, though 

 readily distinguishable by differences in texture and transparency 

 from the shell. Such is also the case with all the Chelmsford 

 specimens yet examined, which abound in fragments of shell exhi- 

 biting in a very beautiful manner the cylindrical diverging and 

 branching tubuli. The accompanying serpentine is disseminated 

 in grains, but has no connection with the organic forms, so that, 

 unlike the specimens in which it is the injecting mineral, the 

 structure of these cannot be brought out by etching with acids. 



These specimens from Chelmsford, it shouldbe said, have been 

 examined and satisfactorily identified by Dr. Dawson. The 

 argument from miueraloo-ical resemblances in favor of the Lauren- 

 tian age of the limestone in question is therefore now supported 

 by the undoubted presence in them of Eozoon Canadense. In 

 this connection it should be said that the crystalline rocks of 

 Newburyport and Salisbury, though separated in Hitchcock's 

 geological map from the gneisses to the south-west, and united to 

 the syenites of Gloucester and Rockport, seem to me very unlike 

 the latter, and closely related lithologically to the gneiss of 

 Chelmsford, which encloses the crystalline limestone. The 

 crystalline limestones occurring with gneissic rocks near Provi- 

 dence, Rhode Island, merit a careful examination for Eozoon, 

 inasmuch as from their lithological characters they may with 

 probability be supposed to be of Laurentian age. 



Montreal, Dec. 12, 1870, 



METEOROLOGICAL RESULTS FOR MONTREAL 

 FOR THE YEAR 1869. 



By C. Smallwood, M.D., LL.D., D.C.L. 



The following Meteorological Report is condensed from the 

 records of the Montreal Observatory, lat. 45*^ 31 N., long. 4h. 

 54' 17" West of Greenwich. The cisterns of the barometers 

 are 182 feet above the mean sea level. 



