Obliged for the Theophrastus. Will return it.
Obliged for the Theophrastus. Will return it.
Son [Leonard] ill with scarlet fever. Also Mrs Darwin.
Intends to give up work on Drosera until Variation is done.
Thanks for maps.
George [Darwin] failed at St John’s [College, Cambridge] and will stay another year at school.
May his son George call for advice on his career?
CD has been ill for past four months.
Discusses income provided for sons at Cambridge.
Thanks for note about George Darwin’s gaining Second Wrangler.
Has not himself experimented with delicacy of tests but sends several illustrations of what other authorities have done. Reference to James Marsh’s test for arsenic and that of Ashley Paston Price for iodine.
Is enclosing Alfred Swaine Taylor’s book On poisons (1848). Reports on his own experiment with the starch test in dissolving iodine in different measures of water.
CD may be interested in a reference to a method of detecting 1/195000 of a grain of sodium chloride.
Also, on Drosera, suggests it would be interesting to try substances such as gun-cotton, in which nitrogen is in very different states from a salt of ammonia.