452 Mr Philip Sewell on the Flora of [sess. liii. 



The apparent difference is slight, and indeed we only 

 realise its full import when we observe that in Lapland and 

 at the Yugor Straits the mean (in summer at least) is derived 

 from slight extremes, in the British Isles often from very 

 pronounced ones. 



A very important condition is that consequent upon the 

 high latitude of these regions, where assimilation and growth 

 are possible for a period extending more or less continuously 

 over three to five months, and where, in the winter, the 

 plant lies inactive for a much longer time than is the case 

 in lower latitudes.* 



Obseevations upon Collections in Lapland. 



The commoner plants observed in Lapland were almost 

 without exception present at each station except at Vard0, 

 where the restricted area of the islands does not afford a 

 suitable habitat for several of the species. 



At Troms0 was the most extensive flora; due to its more 

 southerly position, its neighbourhood to rich mountain areas, 

 and its small belts of birch trees (among which are also 

 Salix and Pyrus Aucuparia^. Our stay was so short at this 

 place, and the season was so far advanced that I was able to 

 observe very inadequately. I noticed, however, the follow- 

 ing commoner plants not met with at the more northerly 

 stations : — 



Viola sylvatica. 

 Lotus corniculatus. 

 Saxifraga ojjpositifolia. 



,, aizoides. 



Heracleum sibiricum. 

 Qinanthe sp. ? 



Galium boreale ? 

 Giia2)lialium sylvaticum. 

 Calluua vulgaris. 

 Veronica ollicinalis. 



,, scrj)yllifolia. 

 Plantago major. 



Many species, also found in the north of Lapland, were 

 here much mcjre luxuriant and vigorous. This was especially 

 noticeable in the following: — Thalidnim, Cocldcaria, Capsella, 

 Lychnis dmrna, Vicia, GeuTn, Alchemilla vulgaris (which also 



* More detailed aocouiitu of the conditions aflectiiif,' tlie diift-ice in the Kara 

 Sea, and also a record of teinjieraturcs observctd during the voyage of the 

 "Labrador," have been publislied in the Magazine of the Scottish Royal 

 Geographical Society, April 1889 ; and in the I'rocccdinfjs of the Scottish 

 Meteorological Society, 1889. 



