394. C. B. Warring—Growth-rings in Exogenous Plants 
KENT'S CAVERN. PERIODS. 
Deposits. Bones. Implements. Archeolog’al Danish-Bog Biological Geograph Climat 
Tron. Tron. Beech. 
: Peduncu- 
lated Oak. 
Black Mould.| Ovine. Bronze. Bronze. Recent. | Insular. Post- 
’ Glacial 
Sessile 
and (?) Oak. 
Neolithic. || Neolithic. 
Scotch Fir. 
Granular 
Stalagmite. ’ 
‘ Paleolithic Contin- 
Black Band. | Hyzenine. 
Flakes. ental. Glacial 
Cave-earth. ari and (?) 
we eis 
Paleolithic. oink 
Inter- 
Crystalline Glacial 
ws Insular. 
Paleolithic 
Ursine. | Nodules. 
Breccia. Contin- 
ental Pre- 
Glacial 
Fae XLV.—Is the Existence of Growth-rings in the Karly 
Exogenous Plants proof oy Alternating Seasons? An extract 
from a paper read before the N. Y. Academy of mahences) 
March 19, 1877; by “see B. WARRING, PH.D. 
WE are told that there must have been the same alterna- 
re seasons necessary to the cate : the rings? 
Until that is established their existence has no importance in 
this connection. Were it possible in some wer to secure a 
temperature uniform through the year we might be able to deter- 
mine the question experimentally. The nearest approach to 
such a condition in this latitude is to be found in green-houses. 
