From G. H. Darwin 8 July 1873
When filled by you the dram measure weighed 281.92 grains & when empty & moist it weighed 226.20 gr.
Therefore you have been using 55.72 gr. as a dram
It should however have been 54.7 gr So that you have been using a dram too large by 1 gr. of distilled water
G H. D.
July 8. ’73
The weight of fluid used by you at 2 oz was 865.5 gr. on one occasion & 866.5 gr on a second occasion taking the average it was 866 gr. 2 oz: weigh 875 gr.
So that you have been using as 2 ounces an amount of water too small by 9 gr.1
CD annotations
Footnotes
Summary
Corrects chemical concentrations CD has been using [in insectivorous plant experimentation].
Letter details
- Letter no.
- DCP-LETT-8969
- From
- George Howard Darwin
- To
- Charles Robert Darwin
- Sent from
- unstated
- Source of text
- DAR 55: 160–1
- Physical description
- AmemS 2pp
Please cite as
Darwin Correspondence Project, “Letter no. 8969,” accessed on 25 April 2024, https://www.darwinproject.ac.uk/letter/?docId=letters/DCP-LETT-8969.xml
Also published in The Correspondence of Charles Darwin, vol. 21