British Museum
14th Novr 1836
My dear Sir,
I have observed a most beautiful instance of circular polarisation in a salt discovered by my friend Dr Dowler, <1> & not yet I believe made known to the world – He obtains it from urinary Calculi and calls it Xanthate of Ammonia – It seems to me peculiarly illustrative of your views, as the crystalline structure of the salt is very distinct, in masses nearly as large as a [illegible deletion] Pea, and presents the appearance of hemispheres, composed of spiculæ radiating from a common centre – I think You should examine this salt before the second part of your paper is read –
Ever my dear Sir, faithfully your’s
John Geo. Children
H F. Talbot Esq
&c &c &c
Notes:
1. Dr Thomas Dowler (d. 1855) of Richmond; MD, etymologist and chemical experimenter (also see Doc. No: 06062.