196 



The sixth for the motions of one muscle of the eye. 



The seventh for the voluntary and involuntary motions of the 

 muscles of the face. 



The eighth is the great respiratory nerve. 



The ninth, for the voluntary motions of the tongue. 



The nerve sometimes enumerated as the tenth of the brain, is pro- 

 perly the first spinal nerve : like those of the spine it has a distinct 

 double root, and is a nerve both of sensation and of motion. 



In the end of the paper certain conclusions are drawn, which have 

 reference to the subjects of the preceding papers of the same author. 

 And here the author advocates the importance of anatomical inves- 

 tigation as superior to experiments on living animals, affirming that 

 erroneous opinions in physiology have been sometimes strengthened 

 instead of corrected by such experimenta. 



An Account of Experiments made with an Invariable Pendulum at New 

 South Wales, by Major -General Sir Thomas Brisbane, K.C.B. 

 F.R.S. Communicated by Captain Henry Kater, F.R.S., in a Let- 

 ter to Sir Humphry Davy, Bart. P.R.S. Read June 19, 1823. 

 {Phil. Trans. 1823, p. 308.] 



In this communication, laid before the Royal Society at the re- 

 quest of Sir Thomas Brisbane, Captain Kater gives the results of 

 experiments made by Sir Thomas Brisbane and Mr. Dunlop, at Pa- 

 ramatta, in New South Wales ; and by Sir Thomas Brisbane, Cap- 

 tain Kater, and Mr. Rumker, in Portland Place, London, with an 

 invariable pendulum belonging to the Board of Longitude. 



The number of vibrations made by this pendulum in a mean solar 

 day at London, in latitude 51 31' 8" 4, at the temperature of 60, 

 and reduced to a vacuum, was found to be 86090' 1 7 : at Paramatta, 

 in latitude 33 48' 43" S., by Sir Thomas Brisbane's experiments 

 86021-59 ; and by those of Mr. Dunlop 86022-21. 



Captain Kater, after detailing these observations, proceeds to de- 

 duce the compression, and finds it, by comparing the vibrations at 

 London with those resulting from Sir Thomas Brisbane's experi- 

 ments at Paramatta, to be -rrf.-s-r ; by Mr. Dunlop's ^-g- } .-jr. 



By the comparison of the vibrations at Unst with those at Para- 

 .matta, Sir Thomas Brisbane's experiments give -3~o-J--vr> an d those of 

 Mr. Dunlop -S-O-'-TTB- for the compression. 



But the author remarks that these numbers are not to be deemed 

 conclusive, as a small alteration in the number of vibrations made by 

 the pendulum would occasion a considerable difference in the frac- 

 tion indicating the compression. 



