On the Structure, Distribution, and Functions of the Nerves. 353 



P.S. — An answer to Mr. SamuelCooper'squestions on thesub- 

 ject of mean solar time, having appeared in your last Number, 

 I beg leave to observe, that your correspondent " Glosterian" 

 is mistaken in the only instance in which he has given a direct 

 answer to Mi*. Cooper's queries. The sun's right ascension, 

 as given in the Nautical Almanack, is expressed in sidereal 

 time, not in solar time. To prove this, it will suffice to ob- 

 serve, that at the instant of the sun entering Libra, his right 

 ascension in the Nautical Almanack is 12 hours; whereas, had 

 it been expressed in solar time, it would be only ll h 58 m 2 s ; 

 the entire circle of the ecliptic passing the meridian in 24 hours 

 sidereal time, which is equal to 23 h 56 m 4 s solar time. 



LXII. Analyses of a Series of Papers on the Structure, Distri- 

 bution, and Functions of the Nerves ,- by Charles Bell, .Es^.,- 

 txhich have appeared in some late Volumes of the Philosophical 

 Transactions. 



[Continued from p. 128.] 



lVTR. BELL in pursuing the anatomy of those parts of the 

 ■*-'■*■ animal frame, which more immediately and distinctly exhi- 

 bit the truth of the hypotheses with which he set out respecting 

 the necessity of our viewing the nervous system, as divided 

 into two grand classes ; the one regulating and controlling the 

 respiratory apparatus, and associating the actions of other parts 

 therewith ; the other proving the source of voluntary motion, 

 and of sensibility; has endeavoured to illustrate that hypo- 

 thesis still further, by the facts and observations which are 

 furnished by the anatomy and physiology of the eye in parti- 

 cular. 



The difficulties which must have presented themselves in 

 making this attempt are, from the very compound nature and 

 functions of this most beautiful organ, such as would be suffi- 

 cient to deter most persons from seeking for illustration from 

 it on any point; and it cannot but be regarded as an addi- 

 tional corroboration of the truth of this theory, when such a 

 complicated system is seen to bear testimony to it in all its 

 parts. 



On the Motions of the Eye in illustration of the Uses of the 

 Muscles and Nerves of the Orbit.— (Phil. Trans. 1823.) 

 The plan which Mr. Bell has adopted in order to confirm 

 his doctrine of the nervous system by the anatomy and phy- 

 siology of the eye is, fist, to show the uses of the apparatus or 

 frame-work, which is exterior to the eyeball ; and then, in the 

 Vol. 64. No. 319. Nov. 1824. Y y second 



