The mother liquors contain oxalic acid and a small qiixntit,y of a We shall now describe in detail the inethod of operating and the nitrogenous acid melting a t 208'. various products obtained, Coiydaline iVit riite. Two litres of dilute nitric acid (1 of acid, sp. gr. 1.42, t o 20 of water) are heated on the water bath and 10 grams of the powdered alkaloid gradually added. The sparingly soluble nitrate which is immediately formed is very insoluble in cold, and soluble with difficulty in hot water, but more readily in the presence of frec nitric acid. It forms thick, tabular crystals without water of crystallisation. Dried a t 1 OW, it yielded the following results on analysis : C = 60.53 ; IT = 7.09. I. 0.2015 gave 0.4472 CO, and 0.12S7 II,O. 11. 0.1659 ,, 9.5 C.C. nitrogen a t 10" a i~d 75s nim. N = 6-92.