CONTENTS. 
I. The Croonian Lecture. On the internal structure of the Human 
Brain, when examined in the microscope, as compared with that 
of Fishes, Insects and Worms. By Sir Everard Home, Bart. 
V. P. R. S. p. i 
II. Some Observations on the Migration of Birds. By the late 
Edward Jenner, M. D. F. R . S. p. i i 
III. On the nature of the acid and saline matters usually ex- 
isting in the stomachs of animals. By William Prout, 
M. D. F. R. S. p. 45 
IV. On the north polar distances of the principal fixed stars. By 
John Brinkley, D. D. F. R. S. &c. Andrew’s Professor of 
Astronomy in the University of Dublin. p. 50 
V. On the figure requisite to maintain the equilibrium of a homo- 
geneous fluid mass that revolves upon an axis. By James 
Ivory, A. M. F. R. S. p. 8^ 
VI. On the corrosion of copper sheeting by sea water, and on 
methods of preventing this effect ; and on their application to 
ships of war and other ships. By Sir Humphry Davy, Bart. 
Pres. R. S. p. 151 
VII. A finite and exact expression for the Refraction of an Atmo- 
sphere nearly resembling that of the Earth. By Thomas 
Young, M. D. For. Sec. R. S. D . 
