BOTANICAL GAZETTE 
74 
[AUGUST 
the movement of plant populations continues, either through a 
further change in habitat or in the development of new plant com- 
munities, the climatic 
vegetation unit is 
Feet in 
dep 
OR NSS Topdestroyed also the climax in 
the stratigraphic se- 
“ sphagnum ‘ 
Ne ae aaa oN peat rials (figs. 5-7). 
ee De iit, 
— EVIDENCE OF CLI- 
i MATIC CHANGES 
| ig TSE cig, a iT ae ae Lower ee carts 
en eS, inert 
“otile, a age ae, A at, Oe TD, pea * - : 
ae eo Peat investiga 
a oe tions are still an 
5F . uh? S Fy Betula stumps _ unspecialized field in 
RRS which the interrela- 
‘a oe on oa A mpm HD AL EEE Me no Upper phrag- ge 3 
[ore mar aoe res Be TO So one Se ANE PT BF Set te See om we mites and tion of climate, geol- 
FS OS HR SONS He Se a site tes ogy, and vegetation 
pugeganns & al] plays the paramount 
oo PCE) Occasional role. Whether in the 
+H betula stump service of science or 
aeey SGRGGERG0RREER of agriculture and 
Peer reir Lower phrag- = other _industries, the 
Stittttttttttitit ~cladium peat +peat-land problem 
sos sen ry eee es ore we = oe comprehends all the 
Ce Re ee ee Rw ee ‘a 
CL LLI LI LOE Hypnum peat complex correlations 
[== SS === =} Macerated peat of plants and _ their 
sean ee et ead habitat; hence it 
® © © © © @| Hei ma should also furnish a 
= ae we Ee historical perspective 
: = =e veal ¥| Lake mud and the points of de- 
= parture which lead to 
It 
Fic. 7.—Generalized section of peat deposit of 
oe ee nk ‘. Tf ] J f+} R awe (29 
past relations. 
would be presumptu- 
ous at this time to 
attempt to draw a parallel between the climatic changes recorded 
in the different peat deposits of this country. A reciprocal 
relation can scarcely be discovered, even in a general way, from 
only the few and incomplete records, and yet, although tentative, 
a short statement descriptive of the preliminary results obtained 
