ii|i liydrdiicn oii trealiiieiil with al>Miliil(' alcdlidl and iiiclallic sodium. 

 In tlie rediiclidii of our own livdi-ocai-lioii. 2.4 hcxadionc luijiiil l>e 

 C-xpcoted in the lirst [liace. alllionuii. a prioii llie lorniation of ol lier 

 hexadienos is not to be excluded. In tiie 2.4 hexatliene 



CH, — CH = CH — CH = CH CI1„ 

 we have again, however a eoniponnd witli a conjufialed svsteni 

 which ininht lie further hydrogeiiat(>d to hexi'iie o. 



In fact, oui' hydrocarlion when treated witii lioiling alt.solute 

 alcohol and metallic sodium takes u[) hydrogen. The study of the 

 product (or products) of the reaction is not facilitated by the contra- 

 dictory statements found in tiie literature about the hexadieiies. A 

 future communication will treat more e.vtensiveiy of this reaction and 

 also of the original hydrocarbon whose structure we will try to ileter- 

 niiiie also by other nielJiods. We may slate further that a diiiromine 

 addition compound has been prepared niehing at Hi^ — 90" and a 

 tetra-coin|iound melting at J 15°. 



University. Or"-, ('hem. Lab. l/trfclit. 



Chemistry. — "^>// thi' hidihu c(/in7//)f/ii In t/ic p,,e-s('ctioih'< hfloir 

 the ('uU'ctir /ii)liif'\ \>\ Di'. A. .S\nTs. (Communieated by Prof. 



II. W. Ü.XKIUIS RoOZKliOOM). 



The y^,r-.sections of binary systems in the neighl)ourlioo(l of the 

 eulectic point have been fully discussed by llvKitris Roozkhoom '); in 

 this the course of the solubility i.sotherms in the unstaitle and metastable 

 region were, however, not exairiined. This proi)lem could oidy be 

 taken in hand after v,\n dk.k W.v.vr.s' paper') on: •'T/if lU/H/'/i/iriinii 

 hi'tirct'ii II sulid liixlji iind a jhiiil jtlidsi-, i'.-:/ii'c/<i//i/ ni tln' iifiijh- 

 hoiirlwod of till' critlciil .stnti'" had bet'U published. 



Availing myself of this paper I shall discuss the just-menliojied 

 problem, and show brietly in what way the stable region is conuecled 

 with the metastaitle and misiable irgion. 



If for the two sulistaiices .1 and P> the volume in solid slate is 

 larger than in liquiil state, these substaiu-es will have negative meltiiig- 



iln 



point curves, i.e. will lie negative, and the meltiiiü-poinl curve 



will therefore |)ass to lower temperatures with increase of pressure. If 



1) Die Heterogene Gleicligewiclile 2, 1^9 (1904). 

 «) These Proceedings Oct. 31, 1903, 439. 



