144 Royal Society : — Mr. H. C. Sorby on Analysis of Animal 



of cloud are as follows : — 



6-9, 6-9, 72, 6-3, 66, 6-4, 64. 



The mean of the three days before last quarter is 7'0, whilst 

 the mean of the remaining four days is 6*42. The mean of the 

 seven amounts is 6*7. 



So also at full moon the mean amounts of cloud are 

 6-6, 7-0, 6-6, 6-9, 62, 6*5, 7*1. 



And here again, though the mean of the seven amounts is 

 6'7, a tendency to dipersion of cloud seems to be indicated after 

 full moon. Indeed the amounts 6*2, at this period, and 6*3, at 

 last quarter, are the minimum amounts of cloud in the lunation 

 for the years 1841-47 at Greenwich. 



Very remarkable conclusions were arrived at by Schubler from 

 sixteen years' observations of the direction of the wind*. The 

 south and west winds (which it is admitted are the most humid) 

 were found to increase in frequency from new moon to the 2nd 

 octant ; whilst the last quarter was the epoch when these winds 

 were at a minimum, and north and east winds reached their 

 maximum. 



Schiibler's results were confirmed generally by Mr.' Glaisher 

 in the spring of this year, from a discussion of the observations 

 of the self-registering anemometer at Greenwich for the years 

 1841-47f. 



The number of hours during which the wind blows in any one 

 direction is accurately registered by this instrument; whilst cloud- 

 measurements cannot be considered more than approximately 

 correct, and moreover leave cue question of the height and den- 

 sity of cloud untouched. 



Your obedient Servant, 



Ewhurst, July 22, 1867. J. Park Harrison. 



XIX. Proceedings of Learned Societies. 



ROYAL SOCIETY. 

 [Continued from p. 66.'] 

 April 11, 1867. — Lieut. -General Sabine, President, in the Chair. 

 HP HE following communication was read : — 

 -*- " On a Definite Method of Qualitative Analysis of Animal and 

 Vegetable Colouring-matters by means of the Spectrum Microscope." 

 By H. C. Sorby, F.R.S. &c. 



1. History. 

 My attention was first directed to this subject by reading a re- 

 port of Professor Stokes's very excellent lecture at the Royal Insti- 



* Annuaire,p. 172. 



t Proceedings of the Meteorological Society, March 20, 1867- 



