To J. S. Burdon Sanderson 26 June [1873]
Summary
Would welcome JSBS visit to discuss Drosera. Nitrogenous fluids can act as ferments only if they act merely by exciting molecular movement in adjoining molecules.
Glass and cotton excite movement and cause cell contents to change visibly. Huxley coming to see this phenomenon.
Studied effect of poisons 12 or 15 years ago to see whether the action was similar to that on nervous tissue.
| Author: | Charles Robert Darwin |
| Addressee: | John Scott Burdon Sanderson, 1st baronet |
| Date: | 26 June [1873] |
| Classmark: | University of British Columbia Library, Rare Books and Special Collections (Darwin - Burdon Sanderson letters RBSC-ARC-1731-1-08) |
| Letter no: | DCP-LETT-8952 |
To J. S. Burdon Sanderson 9 September [1873]
Summary
Pleased JSBS has decided to work on Drosera; sends plants. Does not know whether thermo-electric pile could detect temperature change when leaves close.
CD’s experiment with very weak hydrochloric acid repeated with success: the plants digest albumen more quickly.
| Author: | Charles Robert Darwin |
| Addressee: | John Scott Burdon Sanderson, 1st baronet |
| Date: | 9 Sept [1873] |
| Classmark: | University of British Columbia Library, Rare Books and Special Collections (Darwin - Burdon Sanderson letters RBSC-ARC-1731-1-14) |
| Letter no: | DCP-LETT-9047 |
To J. S. Burdon Sanderson 25 July 1873
Summary
Describes his recent work on Drosera digestion of organic materials, e.g., albumen and gelatin. Edward Frankland has given CD a rough test for pepsin. Some plant extracts cause as much inflection as meat. Has found some reversible inflection with heat and perhaps some heat rigor. Has measured the extreme sensitivity of Drosera with very dilute solution of ammonium phosphate.
| Author: | Charles Robert Darwin |
| Addressee: | John Scott Burdon Sanderson, 1st baronet |
| Date: | 25 July 1873 |
| Classmark: | University of British Columbia Library, Rare Books and Special Collections (Darwin - Burdon Sanderson letters RBSC-ARC-1731-1-11) |
| Letter no: | DCP-LETT-8987 |
| Darwin, C. R. | (3) |
| Burdon Sanderson, J. S. | (3) |
| Darwin, C. R. | (3) |
