530 DK. W. 0. MOOR, 



carefully ou eue drop of ureiue; immediately a yellowish, waxy body луШ 

 form, wliich after 24 liours becomes dry and quite solid. Apparently this 

 newly forraed body is nothing but Urea Nitrate. On closer examiuation, 

 however, it will be found, tliat this combination coutains no urea whatso- 

 ever. For this purpose we dissolve in water a sufficient quantity of the said 

 Nitrate and add gradually to this watery solution enougli Baryum Carbonate 

 to take up all of the nitric acid, so that Baryum Nitrate will form, while 

 the carbonic acid is liberated under effervescence. The луЬо1е is filtered, 

 then evaporated to dryness ata température of 50° C, and the residue 

 treatedwith absolute alcohol; the alcoholic liquid isdecantered or filtered and 

 evaporated at a température of 45 — 50° С. The last residue isиo^г^rcя, but а 

 sticky substance smelling somewhat after ureine, — evidently a derivate 

 of ureine; this sticky substance combines anew with nitric acid as ureiue 

 does. By substituting Sodium Carbonate for Baryum Carbonate we obtain 

 the same resuit. 



My last investigations hâve convinced me, that oxalic acid, too, com- 

 bines with ureine just as it combines with urea. The Ureine Oxalate, how- 

 ever, being more soluble in water or alcohol than the Urea Oxalate is 

 not so easily recognized by the formation of a precipitate as in the case of 

 Urea Oxalate ; but after a part of the water or alcohol has evaporated and 

 the liquid has been allowed to cool off sufficiently, a copious precipitate of 

 yellowish Ureiue Oxalate will form. Now we neutralize with Sodium Car- 

 bonate a watery solution of this precipitate, then we evaporate the solution 

 and treat the residue with absolute alcohol; after the latter has evapo- 

 rated, an oily, ureinlike liquid reraains, whose color however is darker thau 

 that of the unmodified,goldenyellow ureine. This explains, why an almost co- 

 lorless watery or alcoholic solution of ureine becomes somewhat darker and 

 of a reddish hue, when oxalic acid is added. From the aforesaid it will be 

 understood, why I referred to Dr. Kuliabko's and my own good fortune in 

 obtaining ureine; because if I had used for the elimiuatiou of urea greater 

 amounts of oxalic acid than 0,5 — 1,0 gr. to each 100 cbcm of urine, and 

 if Dr. Kuliabko, луЬо used several gramms of oxalic acid to each 100 cbcm 

 of urine, had not neutralized the oxalic acid with Sodium Carbonate and 

 thus had liberated the ureine, though he only meaut to neutralize the sur- 

 plus of free oxalic acid, по liquid constituent of the urine would have re- 

 mained after evaporation! 



Significant in this connection is Dr. Kuliabko's own observation re- 

 garding the precipitate of Urea Oxalate. I shall quote bis own words from 

 bis paper entitled «On Dr. Moor's Ureiue and its physiological effects» 

 (page 500 of the Bulletin de l'Académie Impériale des Sciences de 



Фиг.-Мат. стр. 15^. 2 



