228 Analyses of Books. [March, 



" The eighth, and the Accessory nerve, are respiratory nerves. 



" The ninth nerve is the motor of the tongue. 



" The tenth is the first of the spinal nerves ; it has a double 

 root and a double office ; it is both a muscular and a sensitive 

 nerve. 



" Had I taken the nerves of any other complex organ rather 

 than of the eye, I should have had an easier task. If I had 

 taken the nerves of the tongue, I should have been able to prove 

 by experiment, and in a manner the most direct, that the three 

 nerves belong to three distinct functions, and stand related to 

 three different classes of parts. I could have shown that taste 

 and sensibility belong to the office of the fifth nerve, voluntary 

 motion to the ninth, and deglutition to the glossopharyngeal 

 nerve of the tongue." 



XXII. An Account of Experiments made with an Invariable 

 Pendulum at New South Wales by Major-General Sir Thomas 

 Brisbane, KCB. FRS. Communicated by Capt. Henry Kater, 

 FRS. in a Letter to Sir Humphry Davy. 



The following are the results of these experiments, as given by 

 Capt. Kater: — 



" If the number of vibrations resulting from Sir Thomas Bris- 

 bane's experiments at Paramatta be compared with the mean 

 number of vibrations made by the pendulum at London, we shall 

 have 39*07696 inches for the length of the pendulum vibrating 

 seconds at Paramatta; •0052704 for the diminution of gravity 



from the pole to the equator ; and ■■ for the resulting com- 



pression ; the length of the pendulum vibrating seconds at Lon- 

 don being taken at 39*13929 inches. 



" The experiments at Paramatta being compared with those 

 made by me at Unst, in latitude 60° 45' 28" north, give -0053605 

 for the diminution of gravity from the pole to the equator, and 



- ■ for the resulting compression. 



" If Mr. Dunlop's experiments at Paramatta be compared 

 with those made at London, we obtain 39-07751 for the length of 

 the seconds' pendulum at Paramatta, -0052238 for the diminution 



of gravity from the pole to the equator, and ^^ for the com- 

 pression. Or, comparing Mr. Dunlop's experiments with those 

 made at Unst, we have -0053292 for the diminution of gravity 



from the pole to the equator, and ^-^- for the resulting com- 

 pression. 



" The compressions here deduced must not as yet be deemed 

 conclusive ; for it is well known that a very small alteration in 

 the number of vibrations made by the pendulum would occasion 

 a considerable difference in the fraction indicating the compres- 

 sion. The indefatigable zeal of Sir Thomas Brisbane will, how- 

 ever, no doubt soon furnish additional data." 



