CONTENTS. 
I. 1 HE Croonian Lecture. On the Functions of the Heart and’ 
Arteries. By Thomas Young, M. D. For. Sec. R. * S’. 
page i 
II. An Account of some Experiments , performed with a View to 
ascertain the most advantageous Method of constructing a Vol- 
taic Apparatus, for the Purposes of Chemical Research. By 
John George Children, Esq, F.R. S. p. 32 
III. The Bakerian Lecture. An Account of some new analytical 
Researches on the Nature of certain Bodies, particularly the 
Alkalies, Phosphorus, Sulphur, Carbonaceous Matter, and the 
Acids hitherto undecompounded ; with some general Observations 
on Chemical Theory. By Humphry Davy, Esq. Sec. R. S. 
F. R. S. Ed. and M. R. I. A. p. go 
IV. An Account of a Method of dividing Astronomical and other 
Instruments, by ocular Inspection ; in which the usual Tools for 
graduating are not employed; the whole Operation being so con- 
trived, that no Error can occur but what is chargeable to Vision, 
when assisted by the best optical Means of viewing and measur- 
ing minute Quantities. By Mr. Edward Troughton. Com- 
municated by the Astronomer Royal. p. 105 
V. A Letter on a Canal in the Medulla Spinalis of some Qua- 
drupeds. In a Letter from Mr. William Sewell, to Everard 
Home, Esq. F. R. S. p. 146 
