318 Medicinal Leeches. — List of Ne^do Patents. 



made to them respecting the bat! quahty of the leeches em- 

 ployed ill medicine. The two chief points which they pro- 

 posed to examine, are, 1st, To ascertain the causes which in 

 certain cases render the little wounds made by these animals 

 difficult to cure. 2dly, To examine the circumstances under 

 which certain leeches do not penetrate the skin to which they 

 are applied. On the first point authors agree with physicians 

 in acknowledging that the inconveniences ascribed to leeches 

 ouwht most frequently to be attributed either to the tempera- 

 ment of the patient, or to the nature of the malady, or to the 

 means employed to detach them from the wound, or to the 

 foreign substances employed for staunching the blood and 

 closing the wound. With regard to the second point, MM. 

 Huzard and Pelletier have found that there are offered for 

 sale species of leeches that at first sight entirely resemble me- 

 dicinal leeches, but which differ from them completely; 1st, 

 in their want of the serrated instrument proper to make the in- 

 cisions in the skin, from which issues the blood that the ani- 

 mal sucks ; 2dly, in the conformation of their stomach and in- 

 testinal canal. The experiments of the authors have proved to 

 them that the spurious leeches cannot be employed in medicine, 

 because they do not bite. M. Dutrochet has already de- 

 scribed, in 1817, the Aimelide offered as a new species by MM. 

 Huzard and Pelletier ; but there crept into his work some er- 

 rors relating to the manners, the habits, and the organization 

 of this animal, which for a year has been the particular ob- 

 ject of the authors." — Eev. Ency. Feb. 1825.. 



LIST OF NKW PATENTS. 



To Robert Hicks, of Conduit-street, surgeon, for an improved bath.— 

 Dated 2id March 1825. — 6 months to enrol specification. 



To Francis Ronalds, of Croydon, Surrey, esq. for a new tracing appa- 

 ratus to facilitate the drawing from nature. — 23d March. — 2 months. 



To Richard Wilty, of Kingston-upon-ILill, civil engineer, for an improve- 

 ment in the method of lighting by gas, by reducing the expense thereof.— 

 2,5th March. — 6 months. 



To John Martin Hanchelt, of Crescent-place, Blackfriars, London, and 

 Joseph Delvalle, of Whitccross-street, Middlesex, esqrs.for an improvement, 

 communicated from abroad, in looms for making cloths, silks, and different 

 kinds of woollen stuffs, of various breadths. — 25th March. — 6 months. 



'I'o Joseph Manton, of Hanover-square, gun-maker, for an improvement 

 in shot. — 25th March. — 6 months. 



To John Gotlieb Ulrlch, of Bucklcrsbury, London, chronometer-maker, 

 for improvements on chronometers. — 25th March. — 6 months. 



To Aaron Jennins and .John Bclteridge, both of Birmingham, japanners, 

 for improvements in the method of preparing and working pearl-shell into 

 various forms and devices, for the purpose of ap|>lying it to ornamental 

 uses in the manufacture of japan ware and other articles.— 2!}lh March. 

 — 6 months. 



To 



