154 Mr Trevelyan o?i the Vegetation and Temperature 



and the size of its different parts, have suggested the substitution 

 for the cylinder of the ordinary horse-shoe form of electrico- 

 magnetic bars, and the augmentation, within certain limits, of 

 the number and size of these bars, and also of the length of the 

 spirals. 



As I have not finished my experiments on this subject, I shall 

 at present confine myself to the statement of the foregoing facts ; 

 which I have thought it expedient to publish, not only on gene- 

 ral scientific grounds, but also because the study of the new kind 

 of effects to which it belongs, may be considered as fruitful of 

 important mechanical results. 



On the Vegetation and Temperature of the Faroe Islands.* 

 By W. C. Tkevelyan, M. W. S. Communicated by the 

 Authorf. 



The Faroe Islands, situated between 6l°.26 and 6*2°.25 N. 

 latitude, and 0°.!? and 7°.43 longitude west from Greenwich, 

 are twenty-two in number, of which seventeen are inhabited. 



Most of them may be compared to the summits of mountain 

 ridges, rising out of the ocean, and generally running in a di- 

 rection from north-west to south-east, attaining an elevation of 

 nearly 3000 feet, and usually with deep Avater close to the land, 

 which often rises in perpendicular cliffs to a height of 1200 

 and 1500, in one instance to above 2000 feet. For an interest- 

 ing description of this last mentioned cliff, as seen under cir- 

 cumstances of peculiar interest, I would refer to Scoresby's 

 Journal of a Voyage to the Northern Whale Fishery, p. 368. 



The soil is principally composed of vegetable earth, mixed 

 with the decomposed matter and debris of the different varie- 

 ties of trap-rocks of which (excepting Suderoe, Myggenes, and 

 Tindholm, where there occur beds of coal and clay) these 

 islands consist. 



Some of the mountains are covered with verdure, but most 

 of them towards their summits produce only mosses and lichens, 



• Read (in part) in the Natural History Section of the British Association at 

 Edinburgh, September 11. 1834. 



+ JNIr Trevelyan resided for some time in the Faroe Islands.— Edit. 



