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Ireland, and can 't therefore give us neither any indica- 

 tion with regard to an ancient course of the Rhine. Eru- 

 castrum Pollichii and Eryngium campestre, which are both 

 extremely rare in England, are of more importance already. 

 Prof. Tansley says about the first one, that it is some- 

 times found as an alien in England, as is the case in our 

 country, but that there is one place in Essex, consequently 

 near our Rhine-bed, where it may be regarded as natura- 

 lized; about Eryngium campestre, that it is reported as 

 native in two places on the Kent and Suffolk coasts, 

 consequently at any rate opposite the mouths of our big 

 rivers, which hâve distributed it in a north-vvestern direc- 

 tion. I was however greatly surprised by the information 

 of Prof. Tansley with regard to the two first-named 

 species, Silène Otites and Artemisia campestris. Those who 

 hâve been présent at the above-mentioned meeting will 

 perhaps remember, that immediately after the lecture of 

 Dr. Van der Sleen the word escaped me, that, if it could 

 be shown that a species as e. g. Artemisia campestris in 

 England only grows in the neighbourhood of the Cromer 

 Forest Bed, direct évidence, that this is an ancient Rhine- 

 bed, would be hit upon. In this paper we concluded, that 

 one has the greatest chance to meet Rhine-plants some- 

 where to the south-west of the Cromer Forest Bed. Now, 

 Prof. Tansley literally informs me as follows concerning 

 Silène Otites and Artemisia cam.pestris : "Norfolk and Suffolk 

 only: in "Breckland", i. e. a sandy area (probably old post- 

 glacial blown sand, some think loess-like sand) in west Norfolk 

 and Suffolk". We must represent ourselves this area on the 

 map to the north and to the south of the frontier between 

 Norfolk and Suffolk and situatcd against the west frontier 

 of Norfolk and Suffolk, consequently indeed to the west 

 of the Cromer Forest Bed! Should this still be a mère chance? 

 It goes without saying, that trom the very moment I 

 felt greatly interested in the "Breckland-sands". Let us 



