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 Henry Kater, 
F.R.S. - - - - page 1 
II. 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 
antient alloys of copper. By John Davy, M. D. F. R. S. 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, 182 5 ; 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, made 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 
