( ^^0 ) 



Another method of calciihitioii ulrciulv iuilii'utL'd hy Bekthklot 

 ill 185(i viz. from the moleouhir-volumes and tlie niulecuUir-refrac- 

 tions of the substunces that have interacted, at equal temperatures, 

 led to better results. It has alread\- been remarked by others, that 

 the ethereal salts of the fatty acids in general often seem to be formed 

 without great change of volume and this seems equally to be the 

 case with triacvlins. For capriu the result of this calculation of the 

 molecular-volume even perfectly agrees with the one really found ; 

 it does not result therefrom that this should necessarily be the case 

 with the other terms as well, and in the subjoined table given by 

 Mr. ÖcilEY their deviations are shown. 



A third method of calculation starts from what is found for one 

 of the terms and as all of them rise or fall with an equal diffe- 

 rence of composition, it takes into account the average value of this 

 difference. Starting from capriu, as the purest product, the values 

 calculated on this base and those for molecular-volumes and molecu- 

 lar-refraction concurred pretty well, as will be seen from subjoined 

 tables. 



As to the melting-points it was found that they were quite or 

 nearly quite equal for capric acid and for tricaprin, while for the 

 lower terms of the Iriacylins the meltingpoint is below that of the 

 acid, for the higher ones on the other hand above it, which does 

 not agree with what Bektiielot thought to have found. 



This work will be published in the Keoueil des ïravaux Chimiijues 

 des Pays-Bas et de la Belgique. 



Physics. - y,Uit. the- \"thr(iiionn of' Electrified Systems^ /ihiccd In a 

 MiKjiictic FiehV'. By Prof. 11. A. Lokentz. 



(Rend in the lueetiiis of Jaiiiuiry ~'8"' IS'J'J). 



t^ 1. Many spectral lines show the ZEEMAN-effcct according to 

 till' well known elementaiy theory, and are tiius changed into 

 triplets or, if viewed along the lines of force, into doublets, yet thcie 

 are a rather large number of cases, in which the phenomena are more 

 eonqilieated. CoiiHU ') found that the line />i becomes a quartet, 

 whose outer and inner components are polarized, the first parallel 

 and tiic latter perpendicularly to the lines of force. Similar quartets 

 have been observed in other cases. Sometimes^), in triplets and (piar- 



1) CoRNU, Comptes reiidiis, T. \Hi. 



'■^) JjiJcmJKKiiL ;iiid DissLANDKiis, (Viuipte? ii'udus, T 127, p. 18. 



