CONTENTS. 



V. New Genera of Plants. Communicated by G. A. 

 Walker- Arnott, Esq. A. M., F. L. S., &c. 

 Communicated by the Author, - - 260 



VI. Memoir on the Inquiry, Whether any Terrestrial 

 Animals have ceased to exist since Man's crea- 

 tion ; and whether Man was contemporaneous 

 with Species which are now lost, or which at 

 least do not appear to have representatives now 

 upon our globe. By M. Marcel de Serres. 

 (Continued from vol. xvi. p. 289.) - 268 



VII. On the Seiches of the Lake of Geneva, - 285 



VIII. Observations on the Origin of Mouldiness. By 



M. Dutrochet, Member of the Institute, 305 



IX. On the Change of Colour in the Chameleon. By 



H. Milne Edwards, Esq. - - _ 313 



X. First Essay, preliminary to the Series of Reports 

 on the Progress of the Useful Arts, ordered by 

 the Society of Arts for Scotland, - - 321 



XI. Observations on the Hygrometer, - - 330 



XII. Marine Insects destroyers of Wood, - - 340 



XIII. Critical Notices of various Organic Remains hi- 



therto discovered in North America. By Ri- 

 chard Harlan, M. D., &c. - . - 342 



XIV. On the Structure and Uses of the Mammary 



Glands of the Cetacea. By Professor Traill. 

 Communicated by the Author, - - 363 



XV. Astronomy, - - - . « , - _ 364 



XVI. Table of the Order of Stratified Deposits which 

 connect the Carboniferous Series with the older 

 Slaty Rocks in the Counties of Salop, Hereford, 

 Montgomery, Radnor, Brecknock^ Caermarthen, 

 Monmouth, Worcester, Stafford, and Gloucester. 

 By R. I. MuRcHisoN, Vice-Pres. Geol. Soc. and 

 Royal Geog. Soc, F. R. S., F. L. S., &c. &c. 365 



