approach oacli ollior hohNOcii 50 aiid (U)"/„ I. This caso, IIkm'oCoi'O, Is 

 siinilai lo llic hchax ioiii' of Ihc mixim-cs ol' ("I and S sliidiod some 

 time ai^o'), wilh tins (Uilrrciice tiial toi' tii(M'omposilioii SJ '1„ tiic lines 

 nearly came into conlact. \\liilsl in tliis ease tiic distance remains 

 mncli groatei'. 



The jx'cnliar t'oi-ni of ihc hoilint»' lint^s points, lio\\e\"er, to tlie 

 existence (»f coml)ined molceuh's ot' tlie two eicMnenls. Whethei' these 

 answer to the t'orninla IJr 1 cannot he decided from the form of this line, 

 but perhaps better from the j),x-iines wliich will be studied afterwards. 



Belovv^ the line ADP» the i-egion of the liquids is situated. These 

 on further cooling deposit solid j)hases. These plieuomeua are represented 

 1)\ the two lines EFO and EH(i. The second lini^ shows the 

 inilial and tlic lirsl line the linal solidifying" points. Thev foi'Ui 

 two conlinuoiis lines which however come into conlact at 50 atom 

 pei'cent 1. 



A similai- type of solidilication |ioints as a rule lo un.xcd crystals. 



The equably of the conqxtsilion of licpnd and solid al the con- 

 cenlralion l>r i — without this point being a maximum or a nnni- 

 nnim could, however, oidy be ('X|)laiiuMl by assuming thai Hr I 



is a chemical conqionnd. 



l'ossibl\ this is the case, which has ne\-er as yet Ixmmi salisfaclorily 

 |)ro\'ed, w hei'c a conq>ound is niixal»le with both ils componenls. 

 We will endea\'our lo elucidate ihi^ mailer by a delernunalion (d' 

 ihe densih etc. 



Chemistry. — "(hi ihc uctiou i>/ i'lnulsiu." \\\ Dr. K. ( ). IIkkzoo. 

 (Comnumicaled by Prof. (". A. Pkkki.h \i!iNo). 



(yiomriiiniicjilf'il in the lucrtini^' ol' Oclolter 'M , VMY.\). 



1. If \\(' mix a solulion of canesugar w ith iincrlin and delernnnt' 



ihe (pianlily imerted in detiiule limes at a eonslanl lemperaliii-e, it 



appears thai Ihe iinersion does not proceed as a reaclioji of ihe lirsl 



f \ a \ 

 ordei' /• = -/. . the "eoiislants calculated trom ihis (Miualion 



^ t (i—.r I 



increasing conliuuously (birin<.>- Ihe pei'iod of the in\'ersioii. This 

 might l)e explained by the increasing aclixily of the en/yme oi- by 

 Ihe inlluence exerted by ihe in\ei-| sugar formed. 



\. Mknri -) has shown in an exhausli\'e ])aper llial Ihe latter 

 is the caus.^ and thai Ihe reaclion itroceeds accordinii' to llie law 



1) These Proc. .Uiiie P.)0;i. 



~) Zcitsciif. nil- physikalisrlie Chemie 39, P.»i (P.tOl). 



