CHKMICAL I'.A Till; AM.MAJ, JinDV. ..; 



ondarily owin^ l<t a possible loss during the pn-cip italic. n and i.- 

 1 i.f tin- proteids with wliifli it i.-ah\.i\s l.tr^.-l\ contaminated. 



The lirst ditliculty may be L TOUM.- \>\ the addition of caustic 



h which di-solve-. tli.' ti-*ui- fragment... and thus liheratex the 



al- by .-\tra.-ti. .11 in a 1'apin's digester, 1 in which ra-e the 



.solution i> a^'ain \ery compl 



is, when pure, an auiorphus whit.- jMiwd.-r, readily 

 sulutl'- in ss.it<-i with which it yields a solution which i> u-u- 

 ally, luit in>t alway>. njulcsccnt. This solution contains n 

 which are visible under the inicr..>, ,.) and tiltT> 

 !y without diminution of the ..j... ; the latter m.iv 



!y removed by the addition of free alkalis or arctic acid. 

 I'nder ordinary conditions it is readily precipitated I'.v alcohol 

 when the mixture contains 60 }>.. of the precipitant, hut if 

 i in 0'5 1*0 p.c. solution, even an excess of absolute 

 alcohol is stated not to cause its precipitation. The precipita- 

 tion tikes place at once on the addition of a trace of sodium 

 ohlori 



.1 characteristic port-wine colouration with iodine, which 



does not howe\er distinguish it from eiythrodextrin since in both 



cases the colour, contrary to the older and current statements, dis- 



apjH-ars mi wanning and returns on cooling. On the other hand, 



ire not precipitated by 60 p.c. alcohol, even the m-.^t 



.i'lc of these substances requiring at least 8f> p.c. of alco- 



hol for their precipitation, ami Usually more. It appears that 



the reaction with iodine is most delicate in presence of sodium 



chloride. 4 



Aqueous solutions of ^l\ro._ren are strongly dextrorotatory, but 

 atements as to its sjH-citic rotatoi must be received 



with caution. [Boehm .///./ //..////// 6 "(a) n = -h226-7. h 

 in ]...-. solution (a) D = +203-5 to + 225-6. Landwehr" (a) D = 

 -r-213-3 ]. 



Tht' iiioK-i'iilar ina^iiitiide <f ^lyi-i.^.-n. like that "1 >taivh, is un- 



M^ pri'cipitati-s with taiinic acid. al><> \\itli 



calcium alid luiriniii hydrati-. and \\itli basic lead 



h. .\\.-\i-r !" pl.i.-.-il <n the determination "t tlie 

 :n an analysis of thettv 



' H.-hm. I-flup-r 1 - ^^^l (IMO), x 



n fully treated by KuU in Zt.f. Bid. 1 



S. 161. whoro alo th litrnt |.rhiiirelr qootad. S n.l.liti.. n lly N 



TII (1886] > MJ, and \M^ 



Jaknttt. 1887, 8. SO4. ( 'nuner. #./. Biot. 

 67. 



K -m. GtMil. Jahrfc- I82. S. 1300. 



. ! XXXM. (1M6V V 485. 



A,. > 4W. 



PflU^er - 8ft. 



vui. (|HH; 



.IM>. rttiu:- '"* 



7 



