COICTENTS. Ill 



Page 



XXX. Description of a Stereomcter. By James Alexander Ventress, 

 Esq. Communicated by the Author, - - 143 



XXXI. Notice of some new observations by Mr Brooke on the Sulphato-Tri- 

 carbonate of Lead. By William Haidinger, Esq. F.R.S.E. 14G 



XXXII. On the Structure and Characters of the Lernasa elongata, Gr. a New 

 Species from the Arctic Seas. By R. E. Grant, M.D., F.R-S.E., 

 Fellow of the Royal College of Physicians of Edinburgh, and formerly 

 J-.ecturer on Comparative Anatomy. Communicated by the Author, 147 



XXXIII. On the Atomic Weight of Nickel. By Thomas Thomson, M.D. 

 F.R.S.L. and E. Professor of Chemistry in Glasgow. Communicated 



by the Author, - - - 155 



XXXIV. Notice regarding the Ova of the Pontobdella muricata. Lam. By 

 R. E. Grant, M.D., F.R.S. Edin. &c. Communicated by the Au- 

 thor, - - .160 



XXXV. ZOOLOGICAL COLLECTIONS. - ■ 162 



1. Account of the Capture of a Female Orang Outang, caught on the 

 coast of Sumatra. By Captain Hull. - - ib. 



2. On the use of the Odoriferous Gland of the Alligator as a Bait. By 

 Thomas Bell, Esq. F.L.S. &c. - - ib 



3. Account of the Chiiu, or Unicorn of the Himalayah Mountains. By 



Mr Hodgson, Surveyor General of India, - - 163 



4. On the size of the Asiatic Elephant, - - 164 



5. On the Growth of the young Boa Constrictor hatched from the Egg, ib. 



6. On the Growth and Habits of a young Rhinoceros. By Mr Hodg- 

 son, Surveyor General of India, - - 165 



7. On the Edible Birds' Nests of the Tavoy and Mergui Islands in 

 Siam, - , . - 166 



XXX VI. HISTORY OF MECHANIC AL INVENTIONS AND FROCES- 



SES IN THE USEFUL ARTS, - - - ib. 



1. On the Explosion of Steam Boilers. By Jacob Perkins, Esq. ib. 



2. On the Economy of using highly Elastic Steam expansively, &c. 



By Jacob Perkins, Esq. - - 170 



3. Method of making Transparent Soap, - - 172 



4. Mode of Preparing Emery. By Mr Hawkins, - ib. 



5. Account of a Travelling Railway. By George Hunter, Esq. 173 



XXXVII. ANALYSIS OF SCIENTIFIC BOOKS AND MEMOIRS, ib. 



1. Account of a Curious Manuscript Volume, entitled " The Disco- 

 verie and Historic of the Gold Mynes in Scotland, written in the 

 year 1619. By Stephen Atkinson, - - 174 



2. The Steam Engine Theoretically and Practically Displayed. By George 

 BiBKBECK, M. D. F. A. S. M. A. S. &c. and Henry and James Ad- 

 cock, Civil Engineers. Illustrated by a series of splendid engravings 

 from working drawings made expressly for this publication, 181 



XXXVIIL PROCEEDINGS OF SOCIETIES, - 182 



1. Proceedings of the Royal Society of Edinburgh, - ib. 



2. Proceedings of the Society for Promoting the Useful Arts in Scotland, 183 



