( 4-24 



of I'caclioii should he |H(t|)oi-tiouaI lo llic 4^'' power of tlie ('O-coii- 

 centration whereas it appeai-s lo he propoi-lioiial to the I''^ power 

 of the ('O-eoiicentralioii. Ivcjeeliiiu this hypothesis two fiii-ther sujt- 

 positions i-eiiiaiii. 

 Firstly : 



]. COzrrC-l-O (with mea8urai>le velocity) 



11. CO -[-() = CO, (widi iiiiiiieasiirahle vcloei(y). 

 Secondly : 



J. CO -}-Xi = C + NiO 

 II. CO -f NiO = CO, -f Ni. 

 In the last ease it need not he assumed that one of these reactions 

 takes place with unineasurahle velo<*ily, hul oidy that the second 

 one pi'oceeds more rapidly ihaii ihe lirsl. 



As reganis the nature of the ealalyzer we lhi)d< we ma\ eoiieludc 

 from the result of several experiments, that it is not the carl)on hut 

 the finely dixided nickel which possesses the eatal\tic actioji. 

 Anisti'rdim, Chem. Lal>. Uni\(M'sity. Dee. Hl()2. 



Chemistry. — Professor BvKni is Roozi-;iu)om presents a communica- 

 tion from Dr: J. J. v.vN L.v.vr on: ''The course of the meUuHj- 

 j)oint-Unes of .solid <iI/oj/s or <n>u(/(/(niis.'' (First Commnnication). 

 (flommunicalcd in tlir' mfclinti of December :27, ]902). 



1. In the reseai'ches of van Hi:tkrkn ^) on Tinanial.uams a niel- 

 tingpoiiit-line occurs ^) of a kind, which has not as yet heen studied 

 over such au extended course (from to nearly KM) atom "/„ of mercury). 

 This is chielly due to the fact, that the lempei-atures of fusion of the 

 two metals aie so very different; tin '2'M°, mercni-y — 38.6°. In 

 conscHjuence the meltingpoint-line of the tin meets that of the mercury 



practically at 100 atom "/„ mer- 

 cury, so that the meltingpoint- 

 line of the mercury has not even 

 heen ohserved. We therefore 

 see for Ihe first time a melting- 

 [»oint-line in its full course, and 

 the question arises Avhether the 

 course, found by VxVN Hkteukn, 

 may he predicted theoretically. 

 The answer to this is in the 

 affirmative. Let us, to start 

 with, take the most simple view 

 as regards the moleculai' i)oten- 



llUtl rui 1/ 



--20O 



/„=232' 



JC— 1 



Fig. 1 



1) Dissertation 190^2. (also Report Meeting 29 Nov. 1902). 



2) 1. c. pg. 18. 



