ii CONTENTS. 



Abt. XI. Descriptive Memoir of the Imperial Forest of Bia- 

 lowieza. By the Baron De Brinken, Conserva- 

 tor in Chief, .... 287 

 XII. On the Development of the Vascular System in the 

 Foetus of Vertebrated Animals. By Allen 

 Thomson, M. D. late President of the Royal Me- 

 dical Society. Communicated by the Author, 295 

 XIII. On Changes observed in the Colour of Fishes. By 

 Mr James Stark. Communicated by the Au- 

 thor, 327 



XIV. Notice in regard to the Actinia maculata, - 332 



XV. On the Nervous System of the Crustacea. By MM. 



V. AuDOUiN and Milne Edwards, - ib. 



XVI. Description of a new species of Salix found in Brae- 

 mar. By Mr W. Macgillivray, A. M. Com- 

 municated by the Author, - - 335 

 XVII. On the Lacustrine Basins of Baza and Alhama, in 

 the Province of Grenada in Spain. By Colonel 

 Charles Silvertop. Communicated by the 



Author, 336 



XVIII. On Valleys of Elevation, and their connection with 

 the Origin of Acidulous Springs. By M. Frede- 

 rick Hoffmann, . _ - 349 

 XIX. Arrangement of Rocks. By Dr K. C. Von Leon- 

 hard. Communicated by the Author, - 355 

 XX. On the Geological Relations of the South of Ireland. 



By Thomas Weaver, Esq. F. R. S. &c. - 356 

 XXI. Notice of Plants observed in an Excursion made by 

 Dr Graham with part of his Botanical pupils, 

 accompanied by a few Friends, in August last, 360 

 XXII. Description of a Species of Aira found on Loch-na- 

 gar, in Aberdeenshire. By Mr W. Macgilli- 

 vray, ----- 363 

 XXIII. Description of several New or Rare Plants which 

 have lately flowered in the neighbourhood of Edin- 

 burgh, and chiefly in the Royal Botanic Garden. 

 By It Graham, Professor of Botany in the Uni- 

 versity of Edinburgh, _ . _ 366 

 XXIV. Celestial Phenomena from October 1. 1830 to Ja- 

 nuary 1. 1831, calculated for the Meridian of Edin- 

 burgh, Mean Time. By Mr George Innes, As- 

 tronomical Calculator, Aberdeen, - -' 371 



