on THE ALKALINE MATTEft IN SERUM &C. ]4j; 



Thus ram may be drifted as well as snow, and it will be Observation* 

 ▼ery difficult to affix a gauge to any part of a building, o" "^ain and 

 so that its products shall not be affected by partial currents, "^^'^ S^^S^s, 

 diminishing- or overcharging them ; and allowance mu«t 

 doubtless be made in the results of the foregoing table for 

 this source of errour. 



, On the whole, as the proper subject of calculation and 

 comparison is the rain on the surface of the ground, this is 

 the proper ordinary situation for the gauge; and it should 

 be as remote as possible from all objects that might give 

 rise to eddies in the stream flowing over it. As a further 

 defence, both from these and from sudden frosts, the bottle, 

 into which the rain enters from the funnel, should be placed 

 in a box, sunk in the ground ; above which there should be 

 a cavity sufficiently large to admit the funnel, with its 

 liiouth level with the ground, and a free space of a few- 

 inches round it, the whole being laid with turf, both to keep 

 it neat and to break the spray in heavy showers. On a 

 future occasion I purpose to give a description of the instru- 

 ment 1 now use as a rain-gauge, and to explain the pria« 

 ciples of its construction, 



L. H. 



Eleventh Month 27, ISIU 



XII. 



A Reply to some Observations and Conclusions in a Paper 

 just published in the Qd volume of the Medico-Chirurgical 

 Transactions " On the Nature of the Alkaline Matter 

 contained in various Dropsical Fluids, and in the Serttm 

 of the Blood" : By George Pearson, M. D, F. R. S., 

 S>-c. 



To W. NICHOLSON, Esq. 

 SIR, 



JL WAS favoured a few weeks ago, by Dr. Mareet, the ^ - ^ . 



, . , , , 1 T • T 1 1 • ^ *^acts found hj 



author, with the above named paper, lu it I have the satisfac- the author 



tion to, find many of the fact» confirmed, and none contra- confirmad. 



Vol. XXXI.— Fe». 1812. L dieted. 



