222 Royal Society, 



corpuscles, but of cells in general. With this conjecture the obser- 

 vations of Reraak on the blood-corpuscles of the foetal chick fully 

 accord. Whether the author's further speculation, namely, that 

 the parent-cells are altered red blood-discs, is correct, still remains 

 to be seen. 



The phenomenon of the " breaking off short," or notching of the 

 fasciculus of a voluntary muscle in a transverse cleavage of the 

 fibre, is regarded by Dr. Barry as a natural consequence of the in- 

 terlacing of the larger spirals, which he has described in a former 

 paper ; the fracture, in proceeding directly across the fasciculus, 

 taking the direction in which there is least resistance. 



The position of the filament in the blood-corpuscle is represented 

 as bearing a striking resemblance to that of the young in the ovum 

 of certain intestinal worms, the filaments of which are reproduced 

 by spontaneous division. The author subjoins the following quaere, 

 " Is the blood-corpuscle to be regarded as an ovum ?" 



May 12. — The following papers were read, viz.->- 



" Barometrical Observations, showing the effect of the Direc- 

 tion of the Wind on the Difference between distant Barometers." 

 By Lieut.-Colonel Philip Yorke, S. F. Guards. Communicated by 

 Lieut.-Colonel Sabine, R.A., F.R.S., &c. 



The author institutes a comparison between the barometric heights 

 as observed at the Apartments of the Royal Society, and at his house 

 in Herefordshire, in the neighbourhood of Ross, with a view to as- 

 certain the influence of prevailing winds on the atmospheric pressure. 

 The barometers thus compared together were of the same construc- 

 tion, and by Ihe same maker; and the times of observation, namely 

 nine o'clock a.m. and three o'clock p.m., were the same at both places, 

 the distance between which is 1 1 miles in longitude, and about 20 in 

 latitude. The degree of accordance in the march of the two barome- 

 ters is exhibited by that of curves traced on three sheets accom- 

 panying the paper. The results are given in eight tables. The au- 

 thor agrees with Schubler in ascribing the currents prevailing in the 

 atmosphere to the variable relations of heating and cooling which 

 obtains between the Atlantic Ocean and the continent of Europe at 

 different seasons ; the facts ascertained by the series of observations 

 here presented being in accordance with that hypothesis. If the 

 northerly and westerly winds in England be partly the effect of the 

 expansion of the air on the continent, then the barometer which is 

 nearest to the continent, or in this instance that at London, ought 

 to be relatively more depressed than the one more distant; or if 

 the southerly and easterly winds be regarded as proceeding to the 

 ocean, then, for a similar reason, the barometer nearest to the ocean 

 ought to be relatively depressed ; and that both these effects are 

 produced, is shown by the tables. This view of the subject also, 

 the author remarks, is corroborated by Raymond's observations, 

 detailed in his memoir on the determination of the height of Cler- 

 mont Ferrand, from which it appears that with the north winds, the 

 southern barometer was most depressed ; while the reverse occurred 

 with the southerly winds. 



