( 325 ) 



the other. Brüggkr ^), however, IcUs iis a.ü'aiii and again that it is 

 blue-coloured, so that I suppose that in colour it more resend)les 

 that of Fagelsang. A piece of Ceratopvge-lime which I saw at the 

 (h'oningen (geological Inslitiite, seems to confirm this opinion. 



Finally it remains to be examined where we must look for the 

 origin of this erratic-block. I sup[)0se it to come from a place not 

 tar from Ottenbv. The in ever}- respect perfect resemblance between 

 our erratic and Cerato[)yge-lime that is found thei-e, may first of all 

 be said to speak in favour of this opinion. The circumstance, secondly, 

 that in the Hemebim l()am[»it I found many kinds of erratic-blocks 

 that are also found in Oeland, makes this highly probable. I need 

 only remind of those pieces which I formerly described, pieces of 

 Scolithus-sandstone, sandstone with intersecling layers and Discinella 

 Holsti-sandstone; whilst there arc many more, as I hope I shall 

 point out within a short time. This resond)lancc in erratic-blocks 

 makes it more probable, first that the ice came (h)\\n lo us via 

 those regions, and at the same time that a piece of ('(M-atopyge-limc 

 was l)rou"ht from there to here. 



Chemistry. — In the meeting of Saturday May 30, 1903 Prof. 

 S, HooGKWKRFF and Dr. W. A. van Dorp communicated a ])aper : 

 "■(hi the com pan I ids of inisnt.uratcd /rctoiK's tnith acids'' and iji the 

 meeting of Saturday Septeml)er 26, 1903 Prof. Tu. H. P)Kiikkns com- 

 municated a paper: ''7'he conduct of vegctid diid (iiiini(d jd)ci-s toirai-ds 

 coid-tar-coloiirs\ 



(Both communicalions will not be published in Ihese Proceedings). 



1) Brügger, loc. cit. p. 14. 



(November 25, 1903). 



