42 



which a structure has been observed, of which no other animal is as 

 yet known to partake. 



In cutting through the eye, four processes were met with, arising 

 by distinct tendons from the internal or posterior portion of the scle- 

 rotic, which, passing forward, gradually became broader, and insen- 

 sibly lost themselves in and formed a part of the choroid. These 

 processes had a muscular appearance. The ciliary processes were 

 affixed to the crystalline lens, which was nearly spherical, with the 

 anterior surface somewhat flattened. 



Concerning the use of this structure, especially of the processes, 

 the author observes, that as the natural unwieldiness of this animal 

 probably unfits it for quickly directing its sight to objects which for 

 its own preservation it ought to be able to examine easily and mi- 

 nutely, nature seems to have supplied it with an apparatus calculated 

 to remedy this imperfection. The change in the eye, which adapts 

 it for distinct vision at different distances, the author ascribes in a 

 great measure to the four above-mentioned processes, which upon 

 contracting will shorten the axis of the eye, and produce the desired 

 effect : for near objects, it is observed that this animal has the eyes 

 placed much nearer the mouth than any other, whence, without any 

 adaptation of the eye, it is capable of performing the most essential 

 of its functions, viz. that of examining the food necessary for its sub- 

 sistence. 



Demonstration of a Theorem, by which such Portions of the Solidity of 

 a Sphere are assigned as admit an algebraic Expression. By Robert 

 Woodhouse, A .M. Fellow of Caius College, Cambridge. Communi- 

 cated by Joseph Planta, Esq. Sec.R.S. Read February 12, 1801. 

 [Phil. Trans. 1801, p. 153.] 



In the second volume of the Memoirs of the National Institute, 

 M. Bossut announces a theorem relative to the solidity of a sphere 

 similar to Viviani's, by which quadrable portions of a hemispherical 

 vault are assigned. M. Bossut withholds the analysis that led lu'm 

 to his result, but mentions that it involves an integration much more 

 complicated than that which occurs in Viviani's problem. In the 

 present paper, Mr. Woodhouse furnishes the analysis that leads to 

 the result announced in Bossut's theorem, and, by a transformation 

 of the co-ordinates of the sphere, arrives at a differential expression, 

 the integration of which does not appear more complicated than that 

 employed in the solution of Viviani's problem. 



Account of the Discovery of Silver in Herland Copper Mine. By 

 John Hawkins, Esq. Communicated by the Right Hon. Sir Joseph 

 Banks, Bart. K.B. P.R.S. Read February 12, 1801. [Phil. 

 Trans. 1801, p. 159.] 



This ore was found in the Herland mine, about six miles from 

 St. Michael's Mount in Cornwall. It consists cliitfly of lodes of 



