600 Royal Society. 



the approximation of their edges. In saline solutions they become 

 rather smaller, but preserve their figure tolerably well. 



In an appendix, the author gives an account of his observations of 

 the blood-corpuscles of a new species of Deer inhabiting the mount- 

 ains of Persia, of which a specimen has been lately received by 

 the Zoological Society. Many of these corpuscles presented the 

 singular forms above described. 



A paper was also read, entitled " Meteorological Register kept at 

 Port Arthur, Van Diemen's Land, during the year 1838." By De- 

 puty-Assistant Commissary-General Lempriere, in south latitude 

 43° 9' 6", and east longitude 147° 51' 33". Communicated by 

 Captain Beaufort, R.N., F.R.S. 



The height of the instrument above the level of the sea till the 

 21st of August was 51 feet, 7 inches ; and during the remainder of 

 the year 3 feet. 



A paper was also in part read, entitled " Experimental Researches 

 in Electricity, 16th Series." By Michael Faraday, Esq., D.C.L., 

 F.R.S., &c. 



Feb. 13. — The reading of a paper, entitled " Experimental Re- 

 searches in Electricity, 16th Series." By Michael Faraday, Esq., 

 D.C.L., F.R.S., &c., was resumed and concluded. On the source 

 of power in the Voltaic pile. An abstract of this paper has already 

 appeared in our Number for April, p. 329 of the present volume. 



Feb. 20. — A paper was read, entitled " On the Wet Summer of 

 1839." By Luke Howard, Esq. F.R.S. &c. 



The observations of the author were made at Ackworth, in York- 

 shire ; and the following are his results with regard to the mean 

 temperature and the depth of rain, in each month, during 1839. 



Me.-m Temp. 



nain. 



Mean Temp. 



Rain. 



o 



in inches. 



o 



in inches 



Jan. 37-04 



1-13 



July 59-30 



5-13 



Feb. 39-64 



2-14 



Aug. 58-09 



2-94 



March 39-08 



3-21 



Sept. 54-49 



3-43 



April 44-09 



0-58 



Oct. 48-39 



3-40 



May 49-94 



0-38 



Nov. 43-14 



4-54 



June 56-35 



4-89 



Dec. 37-29 



1-85 



Mean temperature of the year 47-24°. 



Total depth of rain in 1839, 33-62 inches. 



He states that the climatic mean temperature of the place is 

 about 47°, and the mean annual depth of rain about 26 inches. 

 The excess of rain during the year 1839 was therefore very great. 



The author describes the effect of the hurricane of the 7th of 

 January, and follows the changes of the xveather during the re- 

 mainder of the year. 



A paper was also in part read, entitled " On the chemical Action 

 of the Rays of the Solar Spectrum on prejDarations of Silver and 

 other substances, both metallic and non-metallic, and on some photo- 

 graphic processes." By Sir John F. W. Herschel, Bart. V. F.R.S. &c. 



INDEX. 



