( 492 ) 



Finally, we can observe a spherolite of the hexahydrate with a 

 radial structure which now grows centrifugally to the large well- 

 known semi-spheroidal spherolites of ferric chloride (fig. 3c). 



§ J 3. This experiment proves that the abrogation of the metastable 

 condition, or at all events of a liquid condition which is possible 

 under the influence of phenomena of retardation may happen owing to 

 the formation of spherolites which are preceded by the differentiation 

 of the fusion into an aggregate of liquid (/lobules. True, the latter 

 are here isotropous in contrast with the phytosterol esters just 

 described, but the anisotropism of the latter licpiids may be caused 

 also by factors which are of secondary importance for the apparently 

 existing connection between : metastability of liquid conditions, their 

 abrogation by spherolite formation and the possible appearance of 

 liquid globules as an intermediate phenomenon. I will just call atten- 

 tion to the fact that if we set aside a solution to crystallise with 

 addition of a substance which retards the crystallisation, this will 

 commence witli the separation of originally isotropous liquid globules, 

 so-called globulites, which Behrends and Vogelsang commenced to 

 study long time ago. 



All this leads to the presumption that the formation of the aniso- 

 tropous liquid phases as aggregates of doubly-refracting liquid globules 

 may have its origin in a kind of phenomena of retardation, the nature 

 of which is still unknown to us at the present. Before long, I hope 

 to revert again to this question. 



Zaandam, 21 Nov. 1906. 



Physics. — "Some additional remarks on the quantity H and Maxwell's 

 distribution of velocities." By Dr. 0. Postma. (Communicated 

 by Prof. H. A. Lorentzj. 



§ 1. In these proceedings of -Jan. 27 th J 906 occur some remarks 

 by me under the title of: "Some remarks on the quantity H in 

 Boltzmann's Vorlesungen über Gastheorie". 



My intention is now to add something to these remarks, more 

 particularly in connection with Gibbs' book on Statistical Mechanics l ), 

 and a paper by Dr. C. H. Wind : "Zur Gastheorie" s ). 



In my above-mentioned paper I specially criticised the proofs given 



!) J. Willard (tibbs "Elementary Principles in Statistical Mechanics"', New-York, 

 1902. 

 2 ) Wien. Sitzungsber. Bd. 106, p. 21, Jan. 1897. 



