CONTENTS. 
xni. On the Results of Periodical Observations of the Positions and Distances of 
Nineteen of the Stars in Sir John Herschel’s Lists of Stars, favourably 
situated for the investigation of Parallax, contained in Part III. of the Phi- 
losophical Transactions for 1826, and Part I. 1827. By Lord Wrottesley, 
F.R.S.Sfc page 333 
XIV. Researches into the Molecular Constitution of the Organic Bases. By Dr. A. 
W. Hofmann, F.C.S., Professor of the Royal College of Chemistry of London. 
{Second Memoir.) Communicated hy Sir James Clark, Bart., F.R.S. . 357 
XV. Contributions to Animal Chemistry. — Paper V. On the Oxidation of Ammonia 
in the Human Body, with some Remarks on Nitrification. By Henry Bence 
Jones, M.D., M.A. Cantab., F.R.S. , Physician to St. George's Hospital. 399 
XVI. On the Relation of the Direction of the Wind to the Age of the Moon, as inferred 
from Observations made at the Royal Observatory, Greenwich, from 1840 No- 
vember to 1847 December. By G. B. Airy, Esq., Astronomer Royal. . 411 
XVII. On the Action of Nitric Acid on various Vegetables, with a more particular 
Examination of Spartium scoparium, Linn., or Common Broom. By John 
Stenhouse, Esq., Ph.D., F.R.S 413 
XVIII. On Rubian and its Products of Decomposition.— -PdiVt 1. jBj/ E dward Schunck, 
F.R.S 433 
XIX. On the Solution of Linear Differential Equations. By the Rev. B. Bronwin. 
Communicated by Samuel Hunter Christie, Esq., Sec. R.S. &^c. . . . 461 
