IV 
CONTENTS. 
XVIII. On the secondary deflections produced in a magnetized 
needle by an iron shell , in consequence of an unequal distribu- 
tion of magnetism in its two branches. First noticed by Captain 
J. P. Wilson, of the Honourable East India Company’s Ship 
Hythe. By Peter Barlow, Esq. F. R. S. Mem. Imp. Sc. 
Petrop. - - 27 6 
XIX. On the difference of Meridians of the Royal Observatories 
of Greenwich and Paris. By Thomas Henderson, Esq. 
Communicated by J. F. W. Herschel, Esq. Sec. R. S. 286 
XX. Some observations on the effects of dividing the nerves of 
the lungs , and subjecting the latter to the influence of voltaic 
electricity. By A. P. W. Philip, M. D. F R. S. L. and E. 
297 
XXI. On the effects produced upon the Air Cells of the Lungs 
when the pulmonary circulation is too much encreased. By 
Sir Everard Home, Bart. V. P. R . S. - 301 
XXII. Theory of the Diurnal Variation of the Magnetic Needle , 
illustrated by experiments. By S. H. Christie, Esq . , M. A. 
F.R. S. - - - - 308 
XXIII. On the ultimate composition of simple alimentary sub- 
stances; with some preliminary remarks on the analysis of 
organized bodies in general. By William Prout, M. D. 
F.R.S. - - - - - 355 
APPENDIX. 
Presents received by the Royal Society from 17 th November 182 6, 
to 15th June 1827. 1 
Index. - - - 13 
Meteorological Journal kept at the Apartments of the Royal 
Society , by Order of the President and Council. 
