PETRY: VEGETATION OF NEW YoRK STATE 207 
between 11:30 A. M. and 12 M. on September 12, 1916, when the 
temperature at three feet from the ground at station A (on the 
rim) was 73° F.; Fic. 2 shows the soil isotherms of the same date. 
These are typical of the results obtained; charts made from the 
data obtained on other dates show that the isotherms vary but 
little in shape, only moving up and down the slopes within narrow 
limits with changes of temperature outside the basin. When the 
outside temperature falls below that within the basin the system 
of isotherms is of course destroyed. 
As mentioned, Scolopendrium occurs abundantly in this basin, 
which is a typical habitat for it, associated with Impatiens pallida 
Nutt., Asarum canadense L., Rubus odoratus L., Aspidium mar- 
ginale (L.) Sw., Cystopteris bulbifera (L.) Bernh., etc.; this asso- 
ciation is restricted to the upper third of the south slope of the 
basin and is therefore outside the region of very low temperatures. 
The greater part of the basin is occupied by an association in which 
Thuja occidentalis L., Betula lutea Michx. f., and Acer spicatum 
Lam. are the dominant members; ground forms are few, mostly 
Cystopteris bulbifera, Aspidium marginale (L.) Sw., A. spinulosum 
(O. F. Miiller) Sw. var. intermedium (Muhl.) D. C. Eaton, and 
Thuidium spp. The tree members of this association extend to 
the bottom of the basin but are less abundant there than farther 
up the slopes. 
The forest floor association of the bottom area is the striking 
feature of the vegetation of the basin; a list of the species follows. 
DOMINANT SPECIES 
Cornus canadensis L. Phegopteris Dryopteris (L.) Fée. 
Lycopodium annotinum L. Pyrola asarifolia Michx. 
Dalibarda repens L. Ribes lacustre (Pers.) Poir. 
Coptis trifolia (L.) Salisb. 
INCIDENTAL SPECIES 
Lycopodium lucidulum Michx. Aralia nudicaulis L. 
L. obscurum L. var.dendroideum Tiarella cordifolia L. 
(Michx.) D. C. Eaton Streptopus roseus Michx. 
Aspidium marginale Actaea rubra (Ait.) Willd. 
A. spinulosum var. intermedium Diervilla Lonicera Mill. 
