German chemist and professor (1803-1873) who made overwhelming contributions in the fields of agricultural and biological chemistry. ALS in German, signed “Dr. Just. Liebig,” one page, 4.25 x 7, April 25, 1850. Letter to English chemist Dr. John Hall Gladstone, in part (translated): "Thank you for your paper about the behaviour of sulphur when added to PCl 5. This will be recorded in one of the next issues of the Annals. The news that you have been able to confirm the chlorine, phosphorus and nitrogen compound, thus obtaining a new tri-basic acid, was of enormous interest to me…As my health is now so much better, the course of lectures I am giving this summer no longer causes me any anxiety. Please give my respects to Prof. [Thomas] Graham, he is certainly in the best position for giving you the means to determine small amounts of light carburetted hydrogen." Affixed to a slightly larger sheet and in fine condition.
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