CONTENTS. 
VIII. On a new principle of constructing ships in the mercantile 
navy . By Sir Robert Seppings, F. R. S. p. 133 
IX. On the milk tusks , and organ of hearing of the Dugong. 
By Sir Everard Home, Bart. V. P.R. S. 144, 
X. Upon the different qualities of the alburnum of spring and 
winter-felled oak trees. By Thomas Andrew Knight, Esq. 
F. R. S. 156 
XI. On the mode of formation of the canal for containing the 
spinal marrow, and on the form of the fins ( if they deserve 
that name ) of the Proteosaurus. By Sir Everard Home, 
Bart. V. P. R. S . 159 
XII. Some experiments on the fungi which constitute the colouring 
matter of the red snow discoveredin Baffin s Bay. By Francis 
Bauer, Esq. F. L. S. In a Letter addressed to the Right 
Honourable Sir Joseph Banks, Bart. G.C.B. P. R.S. 1 65 
XIII. Some account of the Dugong. By Sir Thomas Stamford 
Raffles, Governor of Sumatra ; communicated in a Letter to 
Sir Everard Home, Bart. V. P. R. S. 174 
XIV. Observations on the Human Urethra, showing its internal 
structure, as it appeared in the Microscope of F. Bauer, Esq. 
By Sir Everard Home, Bart. V. P. R.S. 183 
XV. On the Errors in Longitude as determined by Chronometers 
at Sea, arisuig from the action of the iron in the ships upon 
the Chronometers. By George Fisher, Esq. Communicated 
by John Barrow, Esq. F. R. S. 196 
