. CONTENTS. 



John Graham Dalyell, President of the So- 

 ciety. Communicated by the Society of Arts for 

 Scotland, . • • ■ '^^ 



VIII. On the Habits of Testaceous Mollusca, belonging to 

 the Genera Achatina and Phasianella. By F. 

 Logan, Esq., Surgeon, R. N. Communicated by 

 the Author, .... 47 



IX. Zoological Instructions of the Royal Academy of 

 Sciences, Paris, for the Scientific Expedition re- 

 pairing to the North of Europe. Drawn up by 

 M. Isidore Geoffroy Saint Hilaire. 53 



Additional Notes to the Zoological part of the In- 

 structions given by the Academy. 



Note A On the Varieties of Locality, . 65 



B On the Beaver, ... 68 



C On the Changes of Fur or Plumage accord- 

 ing to the Seasons, . . 70 



D On the Suspension of Life in the Batraciaus 



from the effects of cold, . . -71 



X. Instructions in Zoology and Animal Physiology, for 



the British Antarctic Expedition, . . 72 



XI. Meteorological Observations made at the Imperial 

 Academy of Sciences of St Petersburg, from 1822 

 to 1835, and calculated by M. T. Kupffer, . 77 



XIL On the Boracic Acid Lagoons of Tuscany. By John 



BowRiNG, LL.D., ... 85 



XIII. On the Supposed Existence of Fluoric Acid, as an 



Ingrediej-.t in certain Animal Matters. By G. O. 

 Rees, M. D., F. G. S., &c. . . 90 



XIV. Sketch of Animal Life in Nova Zembla {Nova'ia 



Zemlia). By M. K. E. Von Baer, . 93 



XV. Experiments on the Temperature of Vegetables 

 with the Thermo- Electric Apparatus. By M. 

 DUTROCHET, . . . . 103 



XVI. Register of Mean Temperature, &c. at Applegarth 

 Manse, Dumfriesshire, Long. 3° 12' W. ; Lat. 55" 



