25 



wahrscheinlich ein i^auhes Klima woraus. das den Ubergang voiu 

 milden Klima der TertiSrzeit vermittelte und dem periglazialen 

 ilhnlich war, welches im Hohepunkte der Eiszeit in der Umranduno^ 

 des nordischen Inlandeises herrschte. In diesem unmittelbar pragla- 

 zialen Klima war der Spaltenfrost ebenfalls niit bedeutend gestei- 

 gerter Intensitat wirksam und konnte auf der praglazialeu Ober- 

 flache Skandinaviens eine tiefgehende meehanische Gesteinszertrtim- 

 merung in situ zustande bringen, deren Produkte spater. bei all- 

 mahlich wachsender Ausbreitung des Inlandeises, von demaelben 

 ausgeraumt und in die Grundmorane aufgenommen wurden. 



2. Dopetnienia do pracy »o eliptycznej polaiyzacyi sivia- 

 tta, przepuszczonego przez ciato naturalnie skr^cajqce 

 i pochtaniajqce^'^ . — Note Supplementary to a Paper 

 »On the elliptic polarization of light transmitted 

 through an absorbing naturally -actii'c medium« . Note 

 de U' LADISLAS NATANSON m. t. 



In a paper ^) read before the Mathematical and Natural Science 

 Class of the Academy on October 12. 1908. I discussed the theory 

 of circular dichroism in naturally -active media, or the un- 

 equal extinction, in substances of this class, of the circular compon- 

 ents into which a linearly polarized wave of light can be resolved. 

 In the following note it is proposed t(j consider some further points 

 of the Theory and to make some additional remarks, which perhaps 

 may not be without interest, on its agreement with experimental 

 ■evidence already to hand. 



§ 1. For convenience of reference we state here some of the 

 results previously -) obtained. We consider two opposite circular 



') Bulletin Int. de I' Academie des Sciences de Cracovie, Classe des Sciences 

 Math, et Nat., Octobre 1908, page 764. 



«) Bulletin Inf. for March 1908, pp. 130-131 and for October 1908, p. 771. 

 My attention has been kindly drawn by Mr Cotton to two contributions to the 

 Theory of Circular Dichroism published since his experimental work on the sub- 

 ject was completed. The one is due to Mr E. Carvallo {Comptes Beudus, Vol. 

 122, page 985. 1896) who proceeds from the (modified) Helmholtz Dispersion 

 equations. The other is a very short Note inserted in Vol. II of Mr J. B on s si- 

 ne sq's ThSorie Anali/tiqiie de la Chaleur mise en harmonic avec la Thermody- 



