On the Climate of Sennnr. 99 



four species of plants, though the magnificence, brilliancy, and 

 verdure of the carpets, with which nature temporarily endows 

 them, would lead the observer to infer that they were the effect 

 of a great variety of species. These are confined to the Trian- 

 thema pentandra, the Boerhavia repens, and the dwarf Convol- 

 vulus, bearing a little white flower. 



Analysis of the Water of a Spring on the Estate of Fardel near 

 InverTieithing, 1829- By the Rev. W. Robektson junior, 

 of Inverkeithing. (Communicated by the Author.) 



Xhis spring flows from rocks of that coal formation, which, in 

 this county, rests upon the new transition or mountain limestone. 

 The strata are sandstone, slate-clay, and bituminous shale, clay 

 ironstone, and coal. Iron-pyrites occurs disseminated through 

 the strata. In the neighbourhood greenstone and basalt rocks, 

 of the secondary trap series, are intermingled with the regular 

 coal formation. 



The water running from the spring would apparently fill a 

 pipe of an inch in diameter, and it deposites an ochreous sediment 

 in its channel. 



Bubbles of gas were observed ascending through the water at 

 intervals, and a portion of these was collected by means of a 

 phial and funnel inverted, and submitted to the following trials: 

 In agraduated glass-tube, it did not render lime-water turbid, 

 nor did it sustain any diminution by agitation with, or standing 

 over, either that fluid or solution of potash. It therefore did 

 not contain carbonic acid. 



Upon introducing a stick of phosphorus into another por- 

 tion, slight fumes appeared, and, after standing for two days, an 

 ultimate diminution in volume of six percent, took place, which, 

 on adding the correction of two and a half per cent, for the aug- 

 mentation in bulk of the residual nitrogen by the vapour of 

 phosphorus, gives of oxygen .085. 



In a detonating tube, it could not be made to explode with 

 hydrogen gas by the electric spark, though atmospheric air, 

 treated in the same manner, exploded with facility. 



2 fi 2 



