Bpifal SocietyiX 30ft- 



rderende to'the formis and structure of Clt)ud$,»IBlMS aadl M^i) 

 branes." By William Addison, Esq., F.L.S.I Hiiilw AVvv\mmAi\%Amvc 

 In the course of his researches into tho nature and dfiffin'^fi4<u|-> 

 bercles in the lungs, and into the physical prupertits of. wbftf'ieftEeT, 

 tions of the human structure, the author had occasion to notice vft- 

 rious fibrous and membranous forras ajrising solely fjom pliy»ical 

 agencies. On pursuing the inquiry, he-observod a class of ]))i;eiio- 

 niena indicating some peculiar modifications of the force of coliesiou. 

 Thus he found that transparent liquid streams are visible when va- 

 pours or fluids mingle with one another, and also when solids are 

 dissolving in a fluid ; and that opake deposits, assuming the appearr- 

 aoce of clouds, form on those streams, rendering visible the lines 

 of junction of two fluid or gaseous surfaces. A great number of 

 experiments are described illustrating these general facts, which are 

 afterwards applied to explain various phsenoraena of clouds, films 

 and membranous formations, resulting from the operation of the 

 different cohesive forces which are called into action, under a diver- 

 sity of circumstancesjifjylwjj UtJ?iid jaci gft§«r)9p!,btldi«!S ftmiihrOttgHt 

 into mutual contact. ; jmiui o'lom uig biJxdojlDnu ;jfl) iiiift r^oviorfdo 

 "On the formation or secretion of Alkaline and> KarUtyl fl^disi 

 by Animals." By Robert Rigg, Esq., F.R.S. .:.7')i <n(i 



From the results of a comparison made by the author of the 

 weight of the ashes obtained from a quantity of bread, equal to that 

 which was the sole food of two mice during thirty^eight days, with 

 the weight of the ashes of their excretions during the same period, 

 it appeared that the latter exceeded the former in the prop<>rtiQD of 

 1334 to 934. The amount of soluble salts was also found ta ;be 

 greater in the latter than in the former. From these data, the 

 author infers that both alkaline and earthy bodies are fornned 4)H|< 

 of their elements by the animal system, and found in their; ,e«fij»9 

 tions. I , 



" An Account of the Observation of the total Eclipse of the 3un 

 on the 2 1st of December 1843." By Eientenant J, O, E. Ludlow, 

 E.I.C. Engineers, Superintendent of the Magnetic Observatory at 

 Madras. Communicated by J. C. Melville, Esq., F.R.S., Secretary 

 to the Hon. the Court of Directors of the East India Compajiy. 



The author reports the results of his observation of the eclipse, 

 which was unfortunately much interrupted by the passage of clouds j 

 and he has also taken the opportunity of making observations onithe 

 Magnetic Dip and Horizontal Intensity at certain places onbi? 

 journey. -ui 



" On the Barometrical Variation as affect^ by the Moon's JJjjf 

 clination." By Luke Howard, Esq., F.R.S.i. iink, )i)i; „,,>> 



In this paper, which is a continuation of thit wWbb was publi^J^ 

 in the Society's Transactions for 1841 (p. 277), and in which the 

 average result of the author's observations extended only from the 

 year 1815 to 1832, similar records of calculated averages are given 

 down to the year 1841, and a comparison drawn with those of the 

 former period. The author places the whole of these data in the 

 hands of the Royal Society, for the purpose of being made the basis 



