RECORD: Darwin, C. R. 1874. experiments by placing leaves in warm water. CUL-DAR57.8. (John van Wyhe ed., 2002-. The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Text prepared and edited by John van Wyhe. RN1
NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volumes CUL-DAR 54-61 contain material for Darwin's book Insectivorous plants (1875).
8
April 12 — 1874 experiments by placing leaves in warm water & not using C. of Ammonia
Temp. |
|||||
150º |
2 tin (1 lead) put in |
8. 9 57 |
(1) |
||
145 145º |
Pin |
8º. 9 58' |
(2) |
||
140º |
(2 lead) |
8. 9 59 |
(soon become a little had become little inflected on both sides from being touched |
3 |
|
130º |
2 tins put in by mistake at 130º & raised to 150º |
8. 9 55 |
& left in take water to 150º |
(4) |
|
125 |
1 tin |
a little inflected left hand |
9. 2' |
5 |
|
120 |
O mark |
9. 4' |
—(6) |
New leaf
Fresh. experiment
Temp. 130º water. waved for 1m. certainly caused aggregation
Looked at under compound [microscope] effect as soon as I could effect oscilation arrange micrometer, in 2m or 3m
Temp 125º fell to 119 waved about for 2m, great inflection in. 2m to 3m or 4m when looked red protoplasm had shrunk a little from walls of all the cells, down to base of tentacles; & some elongated oval masses aggregate protoplasm shrank from cell walls all tents. finely inflected — aggregation down to base — cannot be exosmose — This cd hardy be exosmose so quickly.—
5.º p.m tentacles in nearly same state; so spherical masses are not formed 10. P.m. I thought protoplasm somewhat dissolved
April— 14th 7. 8 45 In some of tentacles I am nearly sure entirely dissolved but not in others
(add few spheres for warmth) (Ap 15th 8. A m Greatly Redissolved) 3. Pm much smaller & 2 have disappeared
diagram
1.
7. 8 45'
??
no
8v
(6.) 10. 30' very little inflection & no agg.
Tem 120º. waved for 1m. Single M. .— (11. no aggregation to speak of after 1h. 26m except a trace in a few inflected tentacles & here only here only a trace
(1) 10. 40' glands all white no aggregation perhaps finely granular. 150º Glands white after 1h 43m
(2) 10. 41 glands all white (145º Fahr)
140º no aggregation. after 1h 42m 43
31 10. 44' glands all white (140º Fahrn.)
a good deal of inflection no aggregation
after 1h. 44m leaves left in water to cool Hot House plant
(4) glands all white put in at 130 & raise to 150
some inflection no aggregation—
after 1h 46m.
(5) 10. 55'— to 11. — ie 2 Hours a great deal of inflection. all tents very bright red
(pink) certainly some aggregation —(12. strongly marked aggr. but not spherical)
Temp. 125º after '3h.' below After 1h. 48m. after 3h.
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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 12 January, 2026