RECORD: Darwin, C. R. [1873]. Digestion of albumen (application also of water, hydrochloric acid. CUL-DAR56.53. (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).
53
(1
Sept 6th 10. 35' Digestion of Albumen (p 74)
(1873)
3 2 Sticks with Pins, cubes of albumen with drops of pure water
4º 50', 2 of leaves grandly inflected over the albumen:— I think albumen rounded 1 3d leaf near margin : added plain water. (10. 20' water added)
Sept 7th 10. 55' 2 leaves with mere minute spheres of white left — the 3d with larger mass, but seems much rounded & softened.
Sept 8th 10. 25'— white albumen all gone all 3 leaves : one leaf beginning to reexpand
Sept 9' 8. 20'— (1 leaf almost completely rexpanded; the 2 others half re expanded, (adding water to albumen like rain does no harm).
Sept 10th 8. 10' all 3 leaves fully open & albumen all absorbed
― 11 10. 30 do do do
2 stick Black. cubes of Al. with drops of Hydrochloric Acid 1 to 437.5 of water — 4º 50' I think albumen rounded in one; in the other lamina inflected— .added acid to both (10 20' acid added)
Sept 7th 11. every trace of white albumen, but much glassy fluid on disc of leaf —
Sept 8th 10. 25'— one leaf almost reexpanded, the second leaf still closed, (but I injured it a little with bent needle).
(See 73 A for ring disc)
Sept 9th 8. 20'— 1 leaf almost completely reexpand; the other injured one, I think beginning to expand.)
Sept 10. 8. 10 a leaf fully expanded & albumen all absorbed; the other injured leaf may be closely inflected
Sept 14' 10. 30' now partially reexpanded
4 Red sticks. (Sept 6th. 10. 35) Cube of Ab. with drop C. of Soda (sol. 1 to 437.5. water)
Sept 6 5. P.m all 4 leaves much inflected & I added more of the C. of Soda. — (10. 20' soda add.)
Sept 7th 8. 10' a.m a little more soda added.
― 7th 11. A.m (1) (illegible) pale leaf, I can see some of the straight lines of edge of cubes of albumen plain, but cube much enclosed (Sept 8th. 10. 30' white albumen all gone, & disc of leaf nearly dry) Sept 9th 8. 30' almost fully reexpanded.) Sept 10th 8. fully open & all albumen absorbed looks quite healthy
— (Sept 7th 11. 12' I added to these 4 specs. some small drops Hydrochloric A. 1 to 874 of water)
(7th — (Sept. 7) 11. 5. (2) cube quite plain on one side (: Sept. 8th ,10. 30' albumen all gone disc of leaf nearly dry) (Sept 9' 8. 20', still closed.) (Sept 10th 8. almost fully expanded; looks healthy, all albumen absorbed except few traces palish globules attached to gland of expanded outer tentacles. Sep 11 10. 30 looks healthy alb absorbed.
Sept 7. 11. 10' (3) small leaf cube quite perfect : (Sept 8th. 10. 35', cube now reduced to small sphere of albumen.) (Sept 9th 8. 20' white albumen all quite gone.) Sept 10 8. 15 most tents Half-expanded, ie tents at right angles a little clear albumen on disc) (Sept 11' 10. 30'— almost expanded fully some albumen on disc.) Sept 10th almost all absorbed)
Sept. 7th. 11. 10' 4 cube moderately well preserved but sub-rounded. .(Sept 8º, 10. 35', cube entirely disappeared) (Sept 9' 8. 30', leaf still quite closed.) (Sept 10', 8. 15', just like No' 3.)
(Sept 11' 10. 30' almost fully expanded, some albumen on disc.) (12th 8. almost all absorbed)
(Sept 14th 10. 30' These latter 4 leaves have fully expanded, but 3 of them do not look very healthy
(over)
53v
Digestion
Sept. 7th 11. I put 3 cubes of albumen in Hydrochloric Acid, the same as used before, 1 to 437. of water
Sept 8th 10. 30' cubes as perfect as ever.
― 9th 8. 15 do do do do
― 12' 8. 20' do do do do
― 14' 10 30' do do do do
Some albumen cases & artificial digestion
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 8 January, 2026