312 THE CANADIAN NATURALIST. [Sept. 



instance the coarsely granular series of rock families the general 

 range of their specific gravities may be said to be as follows : — 



Granite - - - - - 2.65 and under. 



Granititc - - - - 2.65 to 2.8. 



Syenite ■ - - - - 2.8 to 2.875. 



Greenstone- - - - 2.875 to 3. — 

 This part of the subject is one of very great interest, but it 

 would be premature at present to discuss it minutely. 



{To he contimicd ) 



NOTES ON THE BOTANY OF A PORTION OF THE 

 COUNTIES OF HASTINGS AND ADDINGTON. 



By B. J. Hakrixgton, B.A., 



During a portion of the summer of 1869, I accompanied Mr. 

 Vennor as his assistant in his exploration, among the Lauren tiau 

 rocks of Ontario, and although my labours were of necessity for 

 the most part geological, I could not resist the temptation of taking 

 an occasional botanical stroll, and jotting down the names of a few 

 old and familiar friends. While many other Townships were entered, 

 it was principally in those of Elzevir, Kaladar and Barrie that 

 attention was given to Botany. The hilly and broken character 

 of the Laurentian country is well known, and this, together with 

 the imperfect drainage of the crystalline rocks, and the frequently 

 scanty and light soil arising from their disintegration, cannot well 

 fail to exert a marked influence upon the vegetation. Thus, 

 among the granitic hills of Elzevir, Caprifoliacc£e are exceedingly 

 abundant, fourteen species being represented. Of the genus 

 Viburnum there were five species, several of these being very 

 common. In the lower ground Ericaceous shrubs, and in some 

 places, more particularly in cedar (Thuja occidtntaUs) swamps, 

 several species of northern Orchids were found. I say low ground, 

 but there is much of the country having this character which is 

 in reality elevated, the imperfect drainage, mentioned above, caus- 

 ing the formation of bogs, marshes and lakes in the hollows among 

 the hills. 



