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together with thèse came a number of plants, which draw 

 at présent specially the attention in our country. I allude to 

 such species as Trientalis europaea, L., Cornus suecica L., 

 Linnaea borealis L., Chimaphila umbellata Nutt. and perhaps 

 other species of Pyrola, Rubus saxatilis L., Goodyera 

 repens R. Br. and Corallorhiza, Monotropa, which are ail 

 typical représentatives of the undergrowth of coniferous 

 wood, growing in moist and relatively warm régions, and 

 which in our country are mostly foundonly in veryfew places. 

 Hâve we got to do hère always with relie-stations? I should 

 think it very likely in the case of such a place as the 

 well-known Trientalis-station near Denekamp e.g., but in 

 other cases it seems to me at least doubtful. Àm I well 

 informed, then young Conifers are often imported straight 

 from the north and with them the seeds might hâve been 

 introduced. I think an enquiry into the character and the 

 history of the stations of our postglacial coniferous wood- 

 plants would be very désirable. In this case the real relie- 

 stations ought to be raised at once to the dignity of 

 national monuments ! As a matter of fact, the coniferous 

 wood also had to yield to a new végétation. Whether 

 this was entirely the case in our country, it is difficult to 

 say. It is often supposed to be so, but I ask myself, 

 whether a bad soil could not hinder the development of 

 a végétation, which owing to a changed climate might 

 hâve corne ? On the other hand it is also true, that in 

 course of time a coniferous végétation improves the soil, 

 sothat with the same climate a more luxuriant végétation 

 can arise. I hâve seen a very remarkable proof of this in 

 the dunes surrounding lake Michigan, where, coming from 

 the lake-side, we fînd first a zone of recently formed 

 dunes, behind them a zone of dunes with coniferous wood, 

 then dunes with a végétation of oaks and last of ail the 

 old inner dunes, covered with the typical beech-wood of 

 the Eastern States, hardly, if at ail differing from such a 



