CONTENTS. 



I. An Account of the construction and adjustment of the new 

 Standards of Weights and Measures of the United Kingdom of 

 Great Britain and Ireland, By Captain Henhy Kater, 

 F,R, S. - - - - page i 



n. description of an improved -Hygrometer. By Mr. Thomas 

 Jones. Communicated by Captain Henry Kater, F.R. S. 53 



III. Observations on the changes which have taken place in some 

 aritient alloys of copper. By John Davy, M D. F. R. 5. In 

 a Letter to Sir Humphry Davy, Bart, Pres,R, S, -55 



IV. Additional proofs of animal heat being influenced by the 



nerves. By Sir Everard Home, Bart, V, P, R, S. 60 



V. The Croonian Lecture. On the structure of a muscular fibre 

 from which are derived its elongation and contraction. By 



Sir Everard Home, Bart. V. P. R.S. - - 64 



VI. An account of the heat of July, 1825 ; together with some 

 remarks upon sensible cold. By W. Heberden, M, D. 

 F.R,S. - - - - -69 



VII. On the transit instrument of the Cambridge Observatory ; 

 being a Supplement to a former Paper, By Robert Wood- 

 house, Esq, Plumian Professor of Astronomy in the University 

 of Cambridge, - - - - 75 



VIII. Account of a series of observations, m^de in the summer of 

 the year 1825, for the purpose of determining the difference of 

 meridians of the Royal Observatories of Greenwich and Paris ; 

 drawn up by J. F. W. Herschel, Esq. M, A. Sec. R. S. 

 Communicated by the Board of Longitude, - - 77 



