CONTENTS. 
I. The Croonian Lecture. On the conversion of Pus into gra- 
nulations or new Flesh. By Sir Everard Home, Bart. 
V. P. R. S. p. 1 
II. On the Laws which regulate the Absorption of polansed light 
by Doubly Refracting Crystals. By David Brewster, LL.D. 
F. R. S. Lond. and Edin. In a Letter addressed to the Right 
Hon. Sir Joseph Banks, Bart . G. C. B. P. R. S. p. 11 
III. Observations sur la decomposition de Vamidon a la tempera- 
ture atmosphe'rique par V action de Pair et de lean. Par Theo- 
dore de Saussure, Professeur de Mineralogie dans TAcademie 
de Geneve, Correspondant de V Institut Royal de France , &c. 
Communicated by Alexander Marcet, M. D. F. R. S. p. 29 
IV. On Corpora Lute a. By Sir Everard Home, Bart. V. P. R. S t 
P- 59 
V. Remarks on the probabilities of error in physical observations , 
and on the density of the earth, considered , especially with 
regard to the reduction of experiments on the pendulum. In a 
letter to Capt. Henry Kater, F. R. S. By Thomas Young, 
M. D. For. Sec. R. S. P« 7 ° 
VI. On the anomaly in the variation of the magnetic needle as ob- 
served on ship-board. By William Scoresby , jun. Esq. Com- 
municated by the Right Hon. Sir Joseph Banks, Bart. G. C. B. 
P. R. S. p. 
VII. On the genus Ocythoe ; being an extract of a letter from 
Thomas Say, Esq. of Philadelphia, to Wm. Elford Leach, 
M. D. F. R S. n, 107 
