62 Analyses of Books. [Jan. 



tive is 128° 54', and the ratio of one side of the base to the 

 height nearly that of 4 to 7. The other incidences are : 



(&', p) = 126° 6' 



(&',gO=no 23. 



This substance is accompanied by pleonast and olive-green 

 pyroxene. 



I have chosen for it the name otforsterite, in honour of the 

 late Mr. Forster, who has so much contributed to the advance- 

 ment of mineralogy by his extensive connections in that branch 

 of science in every part of the world, and by having laid the 

 foundation of one of the finest private collections, now in the 

 possession of Mr. Heuland. 



Article XIII. 



Analyses of Books. 



Philosophical Transactions of the Royal Society of London, for 



1823. Part II. 



The following are the papers contained in this unusually volu- 

 minous part of the Philosophical Transactions. 



XIII. On a new Phenomenon of Electromagnetism. By Sir 

 Humphry Davy, Bart. Pres. RS. 



We have reprinted this communication in the present number 

 of the Annals. 



XIV. On Fluid Chlorine. By M. Faraday, Chemical Assist- 

 ant in the Royal Institution. Communicated by Sir H. Davy. 



In the next number of the Annals, we intend giving a full 

 account of the contents of this paper, as well as of another, by 

 the same chemist, on the Liquefaction of other Gases. 



XIV. On the Motions of the Eye, in Illustration of the Uses of 

 the Muscles and Nerves of the Orbit. By Charles Bell, Esq. 

 Communicated by Sir H. Davy. 



A brief abstract of this valuable paper will be found in the 

 report of the proceedings of the Royal Society in the Annals 

 for May, 1823 ; but we extract the section " On the two condi- 

 tions of the eye, its state of rest, and of activity," on account of 

 the peculiarly important nature of its contents. 



" The eye is subject to two conditions : a state of rest with 

 entire oblivion of sensation, and a state of watchfulness, during 

 which both the optic nerve and the nerve of voluntary motion are 

 in activity. When the eye is at rest, as in sleep, or even when 

 the eye-lids are shut, the sensation on the retina being then 

 neglected, the voluntary muscles resign their office, and the 



