General Science. 379 



a certain number of days, they break the shell in water warmed by the 

 sun. The young fry are presently hatched, and are kept in pure fresh 

 water till they are large enough to be thrown into the pond with the old 

 fish. The sale of spawn for this purpose, forms an important branch of 

 trade in China. — Professor Silliman's Journal of Science, Vol. VIII. p. 

 381. 



36. Mr Lizars Work on the Removal of Ovaria. — We are glad to see 

 that Mr Lizars, surgeon, author of the System of Anatomical Plates, has 

 announced an account of his successful operations for the removal of en- 

 larged Ovaria. In one of these cases, the abdominal cavity was laid open, 

 and an ovarium extracted which measures eleven inclies long, by seven 

 and a half broad, and weighs upwards of five pounds. The work is to be 

 accompanied with four Plates, demy folio size, coloured after nature ; the 

 1st showing the situation and appearance of the viscera, and enlarged ova- 

 rium, during the operation. 2d, The extent and appearance of the wound 

 when healed. 3d, Front view of the ovarium, the natural size. 4th, La- 

 teral view of the ovarium, the natural size. 



3T. Mr Bate's Essay on Spectacles. — This little work, addressed " To 

 all who value their Sight," and entitled " A few Practical Suggestions and 

 Illustrations, intended simply to awaken the attention of every individual 

 to the condition of his eyes, and enable him to promote the improvement 

 and preservation of that invaluable faculty," has just been published by 

 Mr R. B. Bate, optician, Poultry, London, whose professional eminence 

 and acquirements are well known. The treatise is written with great per- 

 spicuity and plainness, and is well worthy the perusal of all classes. 



38- Mr Innes's Tide Tables for 1825. — Mr Innes, whose talents as an 

 astronomical calculator are well known to the readers of this Journal, has 

 published (in November 1824) his " Aberdeen, Leith. and London Tide 

 Tables for 182o, with various other useful tables, and a list of vessels re- 

 gistered at the port of Aberdeen." This little work has all the advantages 

 pf an almanack, and will be found of great use to commercial readers. 



39. The E?nperor of Russia's Present to Professor Barlow* — His Ma- 

 jesty the Emperor of Russia has presented Professor Barlow, of the Royal 

 Military Academy, through his Excellency Count Lieven, with a gold 

 watch and rich dress chain, as a mark of the value which his Majesty 

 places on the magnetic discoveries of that gentleman, and their important 

 application to the science of navigation. 



Aut. XXXVI.— LIST OF PATENTS FOR NEW INVENTIONS, 

 SEALED IN ENGLAND SINCE JULY 27, 1824. 



July 27. For Improvements in Power Looms, and Preparation of U'arps- 

 To T. W. SiANSFiiLD, Leeds. 



