Oxalic jEther, and Compounds 

 derived from it. 



C- H"5 O^ oxalic aether 

 C'-H'"0% C^O' oxalovinic 



CJdorine and. Oxalic ^ther. — State of Urea m Urine. 5^5 



results of these experiments is the preservation of the chemi- 

 cal properties of the oxalic aether after it has exchanged ten 

 atoms of hydrogen for ten of chlorine. In examining the fol- 

 lowing table, in which are stated comparatively all the trans- 

 formations of oxalic aether and of chloroxalic aether, we shall 

 arrive at the conviction that the one series is merely a repe- 

 tition of the other. 



Chloroxalic iEther, and Compounds 

 derived from it. 



CiiCl"'0^ chloroxalic aether 



C"-Ci'«0', C*0' chloroxa- 



^^^^ lovinic acid 



C'^ H'" OS C^ O', H^ O hy- c'-' Cl-^ 0\ O O', H^ O hy- 

 drate of oxalovinic acid , ^rate of chloroxalov. acid 

 C'^ H'^' O', C^ 0\ B O oxalo- C'^ CI'" 0\ C^ O', B O, chlo- 



vinates roxalovinates 



C'^ H'° OS O O^ N^ H^ ox- C'^Cl"^ Os O O^ N' H^ chlo- 



amethane roxamethane 



O O^ N^ H^ oxamid ^ O^ N^ H^ oxamid. 



Not long ago, if, after the inspection of this table, chloroxalic 

 aether had been said to be, chemically speaking, nothing further 

 than oxalic tether containing chlorine instead of hydrogen, no 

 objection would have been made. But this is perhaps no longer 

 the case at present; the mode of expression will nevertheless be 

 the most simple and most pure as given by experiment. 



Before concluding this notice, we may direct attention to a 

 paper in the Annates de Chimie ct de Physique, by De la Provo- 

 staye, on the Isomorphism between Oxamethane and Chlor- 

 oxamethane, of which a translation has already been presented 

 to the readersof this Journal (p. 372); his conclusions as to their 

 isomorphism must, however, be confirmed before they can be 

 adopted. Prof. H. Rose, in a paper recently published on 

 the Combinations of the Volatile Chlorides with Ammonia, 

 (Taylor's Scientific Memoirs, vol. ii. p. 32,) which contains 

 some valuable remarks on Dumas's theory of substitutions, 

 hints at the measurements of the crystals not being satisfactory. 

 State of Urea in Urine. 



Very different views have been entertained respecting the 

 state of urea in urine. Persoz considers it to be merely a pro- 

 duct of sundry reactions, especially of heat, on urine, whicli he 

 conceives to be proved from the syrupy mass obtained by 

 freezing urine at — 1 3° to —18° centigrade, when treated with 

 nitric acid, only producing crystals of the nitrate of urea, alter 

 it has been for some time heated. Morin admits in urine solely 

 a chlorine compound of his uril. Cap and Henry, on the con- 

 trary, maintain that urea is present in the urine of man as the 

 lactate of urea. The experiments which M. Lecanu has re- 



Phil, Mag, S. ". Vol, 1 8. No. 1 20. Supid, Jul// 1 8 1 1 . 2 N 



