ii CONTENTS. 
Art. XIII. Observations on the presumed Analogy of certain 
Organs of the Embryo, in several distinct Races of 
Vascular Plants. By John Yule, M.D. F.R. S.E. 
Fellow of the Royal College of Physicians, Edin. 270 
XIV. A Description and Draught of a New Invented Ma- 
chine, for carrying Vessels or Ships out of or into 
Harbour, Port or River, against Wind and Tide, or 
in a Calm. By Jonathan Hulls. With a Plate, 274 
XV. Reflections on Volcanoes. By M. Gay Lussac, 278 
XVI. On the Refractive and Dispersive Power of different 
Species of Glass, in reference to the improvement 
of Achromatic Telescopes, with an Account of the 
Lines or Streaks which cross the Spectrum. By 
Joseph Frauenhofer of Munich. With a Plate, 288 
XVII. Description of Vettie’s Giel, a Scene in Bergen-Stift, 
in Norway. By the Rev. U. F. Borgesen, 299 
XVIII. On the Heights of the principal Snowy Peaks of the 
Himalaya Mountains. By Captain J. A. Hodgson, 
and Lieutenant J. D. Herbert, - 312 
XIX. Sketch of the Geognosy of Madeira and Porto Santo. 
By T. Edward Bowdich, Esq. Conductor of the 
Mission to Ashantee, M. W. S., &c. - 315 
XX. Account of Mr Ronald’s Pendulum Doubler of Elec- 
tricity, - - 322 
XXI. Biographical Notice of Baron Samuel Gustavus 
Hermelin, - 325 
XXII. Account of Mr Perkins’ method of applying his New 
Method of Generating Steam to the Boilers of or- 
dinary Steam-Engines, - - 328 
XXTII. Mineralogical Description of some Aerolites which 
fell near Wiborg in Finland. By Nils Norden- 
skiold. Esq. M. G. S. - - 333 
XXIV. Observations on Double Stars. By M. Struve of 
Dorpat, and Professor Amici of Modena, - 334 
XXV. Journal of a Tour to the Coast of the Adriatic Sea, 
and to the Mountains of Carniola, Carinthia, Ty- 
rol, Saltzburg, and Bohemia. By Dr David Hen- 
ry Hoppe and Dr Henry Hornschuch. (Con- 
tinued from p. 94.) - - - 341 
XXVI. Observations on the arguments adduced in support 
of Circular Sterns, - - 353 
XXVII. On the Discovery of the Foramen centrale of the 
Retina in the Eyes of Reptiles. By Dr Knox, 358 
