Vegetation of Northern Cape Breton. 467 



Whitford, H. N., 1901. The genetic development of forests in 



northern Michigan. Bot. Gaz. 31 : 289-325. /. 1-18. 

 Yapp, R. H., and Johns, D., 1917. The salt marshes of the 



Dovey Estuary. II. The salt marshes. Jour. Ecol. 5 : 



65-103. pi. 12-16 -\-f. 1-13. 

 ZoN, R., 1914. Balsam fir. U. S. Dept. Agr. Bull. 55. pp. 



1-68. /. 1-8. 



