34 TROWBRIDGE: THE THERMOMETRIC MOVEMENTS 
movements accompanying a fall of temperature. In one class, : 
(a), the branches became depressed; in the second, (0), they rose 
at first, then with continued fall of temperature became depressed; — 
and (c) they became elevated without being depressed. The 
measurements were carefully made on ten species of trees. No 
definite conclusion, however, as to the cause of the movements . 
was arrived at by Professor Caspary, although he suggested the 
theory that the movements were caused by a differential expan- z 
sion between the upper and lower sides of the branches. : 
Daily R M e HEIGHT OF BRANCH | | 
é / \ f Tree No. 1 
| Il | ‘= / Linden 
est EAA MOLI 
é ; | \ ag6 \ 
| h/ | y gia I Relative 
ally \ [ LTA |B [Samer 
TTY ai AN A al 
o SH AY \S VON 
HE ef 4 4 
Fa 
i \ Ke # \ f Temperature F 
: + i \ Peat not wetness 
va i ; Nt 
i a 
505 16 17 19 20 oa a 27 28 29 2 4 if r as 23 25 26 Sais 0” 4 
ee 
Fic. 4. Daily record of Branch A, Tree No. 1 (European linden) during February _ 
and March, 1912. Broken lines indicate where the daily record was not continuous: — 
relative humidity record (fine line curve), apparently has little effect on the position : 
of the branch. ; ’ 
Later the following paper appeared: ‘‘ Recherches sur la quan- — 
tité et la répartition de l’eau dans la tige des plantes ligneuses,” — 
by N. Geleznow.* This contribution deals chiefly with the — 
amount of moisture in the various parts of branches and tree : 
trunks. Observations on the change in the position of branches — 
with change of temperature were also made. Geleznow stated — 
that he had first noted the phenomenon in 1854-5, and experi- — 
ments made by him in 1864 and 1865 showed that the excentric 
» Bull. Acad. Imp. Sci. St. Petersburg 9: 667-685. 1873-1877. 
