142 Proceedings of Philosopliical Societies. [Fei^. 



The loss is too great ; but I was not supplied with a sufficient 

 quantity of the ore to repeat tlie analysis. From my mode of pro- 

 ceeding, I think it likely that the whole, or nearly the whole, of 

 the loss was sulphur. In that case the ore would be a compound of 



Sulphuret of lead 57-269 



copper 40*850 



iron 2-190 



100-309 



Or, supposing the sulphuret of iron accidentally present, it i* 

 composed of an integrant particle of sulphuret of lead and two 

 integrant particles of sulphuret of copper. 



20. Notice concerning the Structure of the Cells in the Combs of 

 Bees and IVasps. By Dr. Barclay. — It appears, from this commu- 

 nication, that the partitions between different cells in the combs of 

 bees and wasps are all double ; or in other words, that each cell is 

 a distinct, separate, and in some measure an independent structure, 

 agglutinated only to the neighbouring cells : and that when the 

 agglutinating substance is destroyed, each cell may be entirely 

 separated from the rest. 



Article XIII. 

 Proceedings of Philosophical Societies. 



ROYAL SOCIETY. 



On Thursday, the 12tli of January, the remainder of Mr. 

 Travers's paper on the way in which the eye accommodates itself to 

 the sight of objects at different distances, was read. He considejs 

 the iris as muscular, and as connected with a kind of inner iris, or 

 ring, which by its contraction increases the convexity of the lens. 

 The eye he conceives is only acted upon by the stimulus of light. 

 Hence he believes that the contraction of the iris is regulated 

 entirely by the retina. The eye, in his opinion, is fitted naturally 

 for viewing distant objects. When near objects are viewed the iris 

 contracts, in consequence of which the inner ring acts upon the 

 lens, and increases its convexity. The sensation of fatigue he 

 supposes owing to the over-action of the external muscles of the 

 eye, and not to any fatigue in the iris itself. 



On Thursday, the 19th of January, a paper by Dr. Storer was 

 read, giving an account of a well dug in Bridlington harbour, 

 Yorkshire, within high water-mark. The bottom of the harbour is 

 a bed of clay ; through this they bored to the rock btlow ; a tinned 

 copper pipe was then put into the circular cavity, and the whole 

 properly secured. The cavity was soon filled with pure water. 

 When the tide rises to within about 50 inches of the mouth of this 

 well, the fresh water begins to flow over, and the quantity flowing 



