1820.] New Patents. 315 



Mr. Godwin will shortly publish a new work under the title — " Of Popu- 

 lation ; an Inquiry concerning the Power of Increase in the Numbers of 

 Mankind : being an Answer to J\lr. Malthus's Essay on that Subject." 



Dr. Rigby, of Norwich, has in the press, Franingham, and its Agriculture ; 

 a Treatise designed to show the Utility of applying the New System of Agri- 

 culture to small Farms. 



Mr. W. G. Rogers will publish, early in October, an Engraving of the War- 

 wick Vase, in the lithographic manner. 



JDST PUBLISHED. 



Le Dentiste de la Jeunesse, or the Wav to have sound and beautiful Teeth. 

 By J. 11. Duval. 8vo. 7*. 



A Toxicological Chart, in which are exhibited, at one view, the Symptoms, 

 Treatment, and Modes of detecting the various Poisons, Mineral, Vegetable, 

 and Animal, according to the latest Experiments and Observations, By a 

 Member of the Royal College of Surgeons. 2s. 6d. 



A Sketch of the History and Cure of Febrile Diseases, more particularly as 

 they appear in the West Indies among the Soldiers of the British Army. By 

 Robert Jackson, M.D. 2 vols. 8vo. the Second Edition, with many Addi- 

 tions. 



The Hunterian Oration delivered before the Royal College of Surgeons, 

 London, Feb. 21, 1820. By Anthony Carlisle, F.R.S. F.L.S. 4to. 4s. 



Elements of the Theory and Practice of Physic. Designed for the Use of 

 Students. By George Gregory, M.D. 8vo. 10s. 6d. 



Lectures on the Structure and Physiology of the Parts composing the Skele- 

 ton, and on the Diseases of the Bones and Joints of the Human Body, &c. By 

 James Wilson, F.R.S. 8vo. \Qs. 



An Historic Sketch of the Causes, Progress, Extent, and Mortality of the 

 Contagious Fever epidemic in Ireland during the Years 1817, 1818, and 1819. 

 By William Harty, M.B. 8vo. l6s. 



An Introduction to the Knowledge of Fungusses, intended to bring into No- 

 tice this much-neglected Tribe of Vegetables. With Plates. 12mo. 5s. 



Article XII. 

 NEW PATENTS. 



Job Rider, of Belfast Foundry, Ireland, for certain improvements which 

 produce a concentric and revolving eccentric motion, applicable to steam- 

 engines, water-|nimps, mills, and other machinery. July 20, 1820. 



Henry Boifield Thomason, of Birmingham, for improvements in the making 

 and manufacturing of cutlery, viz. table-knives, desert-kni\es, fruit-knives, 

 pocket-knives, scissars, razors, and surgical instruments. July 20. 



James Harvie, Glasgow, late of Berbice, for improvements in the construc- 

 tion of machines, commonly called ginning machines, and which are employed 

 in separating cotton wool from the seeds. Communicated to him by certain 

 persons residing abroad. Aug. 18. 



George Millichap, of Worcester, for an improvement on axletrees and boxes. 

 Aug. 18. 



