222 BOTANICAL GAZETTE [MARCH 
14 year old individual situated in the midst of the stand and only 
a few feet from the “Wolf” tree. In fact, the “Wolf” tree may 
have been one of the seed trees from which the stand had arisen. 
The cutting was made at approximately breast height, and already 
on June 13 the annual ring exhibited some go new tracheids. 
Three weeks later summer wood formation began. It follows that 
up to July 1, at least, we may expect many discrepancies in growth 
to occur. The greater the difference in vigor between the two 
trees compared, the greater will be the difference in the amount of 
growth at that period. 
Others have noted the same growth irregularities between 
different individuals of the same species. Among these is Rost. 
HArRTIG (10), who expresses himself emphatically on this point. 
I quote from his text as follows: 
Bei freiem Stande und directer Insolation des Baumes, besonders aber 
des unbedeckten Bodens beginnt der Zuwachs in den unteren Stammtheilen 
weit friither, als im geschlossenen Bestande und bei einem Boden, der entweder 
beschattet (Nadelholzstand) oder von einer dichten Humusdecke bekleidet ist. 
An too jihrigen Fichten, welche isolirt an einem Siidhange standen, war schon 
am 1. Mai auf Brusthdhe der Dickenzuwachs in Thitigkeit, an ebenfalls 
frei stehenden gleich starken Biumen des Nordhanges auf nasskaltem Boden 
war am 26. Mai noch kein Zuwachs bemerkbar. Im vollen Waldesschlusse 
zeigten manche Fichten und Kiefern selbst am 1. Juni noch ruhendes Cambium 
auf Brusthéhe, u.s.w. 
An excellent illustration is likewise afforded by WIELER’s table 
(table I). Trees I and II were in a 40 year stand, where they had 
_been subjected to similar silvicultural conditions. WH4ELER failed 
to say whether tree II was bored on the north or south side, but 
in either case the tracheid numbers are seen to be quite different 
from those in tree I. Growth curves from neighboring trees under 
similar conditions never coincide. Fluctuations are constantly 
arising which upset the regularity of growth and for which no one 
factor is responsible. 
Termination of secondary growth in aerial growth 
The autumn condition of the cambium was observed in tree 1 
both in rgr2 and 1913, inasmuch as cuttings first began on this 
tree on August 5, 1912. The data given in table K include the 
