488 Canadian Record of Science. 



DESCRIPTION OF FIGURES. — PLATE III. 



No. 1. — Gabbro porphyrite from North Burgess. The 

 thin section was photographed in ordinary transmitted 

 light, a number two objective being used in the micro- 

 scope. Two large phenocrysts of plagioclase are shown. 

 The feldspar of the second generation is also shown in 

 white. The minerals filling the interstitial spaces do not 

 come out distinctly. 



No 2 (a). — Dyke rock (porphyrite) near Seeley's bay, 

 Eideau canal. Photographed under the same conditions 

 as No. 1. A number of phenocrysts of plagioclase and 

 •one or two of pyroxene are shown. The feldspar in the 

 groundmass is also brought out. 



No. 2 (b). — This is a portion of No. 2 (a) more highly 

 .magnified, a number seven objective being used. The 

 white central portion represents an end of a plagioclase 

 phenocryst. The feldspar of the groundmass is also 

 shown. 



The writers are indebted to their friend Mr. William 

 Lawson, B.A.Sc, for the photo-micrographs from which 

 these figures are taken. 



Geological Department. 

 School of Mining. 



On the Ferns in the Vicinity of Montreal. 



By Harold B. Cushlng, B.A. 



Montreal has been spoken of by more than one writer 

 as a very favorable locality for collecting plants. How- 

 ever this may be with regard to plants in general, the 

 remark is certainly true of the ferns, principally on 

 .account of the situation of the city at the foot of Mount 

 Eoyal. In the comparatively small area comprised by the 

 .mountain, we have rich damp woods, rocky hillsides, 



