ILLUSTRATIONS 
Text Figures 
OPP. PAGE 
Figure 1. Topographic map of the Grasse River Marsh Region. Frontispiece 1 
2. View of Grasse River Bog from ridge above Town Line Pond..... 14 
3. The bog seen in relation to Massawepie Lake................... 14 
4. View of southern section of Grasse River bog............:...... 19 
5. A plug of peat showing the firm sod in sphagnum-sedge association. 19 
6. The bog between Grasse River railroad and Town Line Pond. A 
more advanced stage of shrub invasion...................... 20 
7. Closing in of the invading shrub association.................... 20 
8. Closed sphagnum-shrub association. Conifer bog forest in back- 
PTOUN «6.25 22 ete hs abo atehactc aeck sys, aueg ere: Cee 21 
9. Deer trail across closed shrub association.....................-- 21 
10. Dissection of a sphagnum-shrub mound........................ Bye 
11. Remnant of charred stump under sphagnum-shrub blanket....... 22 
12. A wet area of the bog with Carex stricta; standing firescarred snag. 24 
13. Invasion of bog-shrub association by black spruce and tamarack.. 24 
14. Spreading habit and layering of black spruce................... 26 
15. Dissection of black spruce clump to show layering and suppression 
Of sphagnum nati cepa ds nos tee tio eiaelo eee eee 26 
16. Oldest stage of conifer bog forest. A very large black spruce..... 28 
17. Transition stage from bog conifer to balsam swamp forest........ 28 
18. An island of timber on non peat covered sand.................. 32 
19. Grasse River flood plain and destroyed balsam swamp forest on low 
non peat covered sands’... oo... 2<. 50 wt shy ae 32 
20. Willow-alder association invading marsh meadow on low non peat 
covered ‘sands Mec BAW Poot Acco eee a ehtas Sees 34 
21. Typical beaver meadow and alder thicket on the Grasse River flood 
plains,, Nowsphagntim::... ootys clade J ys cit deere eee 34 
22. Harvesting hay on the beaver meadow. Grasse River flood plain. 42 
23. Shrub heath and pine heath of Plattsburg sand plain............ 42 
Maps AFTER PAGE 
1. Base map of Grasse River bog with data of E and F profiles..... . 42 
2. Map of vegetation types of Grasse River bog and surroundings... 42 
