fiii OTO*36r^E N T S. 



SUPPLEMENT TO VOL. XXIX. 



Engravings of the following Subjects: 1. Mr. Davis's Fire-escape. 2, Mr. 

 VV. Moult'ij FilteriivG: Apparatus. 3. Mr. B. Smith's Mctliod of relieving 

 a Horse, that has lallea in tiie Shafts of a loaded Cart. 4. Mr. J. Taylor's 

 Extractor of foul Air from Mines, &c. 



L Method of assistiug the Escape of Persons, and the Removal of Property 

 from Houses Oil Fire : by Mr. John Davis, No. 7, John Street, Spitalfieids 321 



IL New Method of applying the Filtering St04ie for purifying Water: by Mr. 

 William Moult, No. 37, Bedford Square - - - 324 



nr. Method of raising a loaded Cart, when the Horse in the Shafts has fallen : 

 by Mr. Benjamin Smith, No. 11, Turnham place, Curtain road. Shore- 

 ditch .---.--- 326 



IV. Method of Ventilating Mines, or Hospitals, by extracting the foul Air from 

 them : by Mr. John Taylor, of Holwell, near I'avistock - 330 



V» On the Processes employed to cause Writing to disappear from Paper, to 

 detect the Writing that has been substituted, and to revive that which has been 

 made to disappear; Improvement of common Ink; a Notice (rf a new Ink, 

 that resists the Action of chemical Agents : by B. H. Tarry, M. D. 339 



VL On the Senje of Smell in Fishes ;• by Mr. C. Dum^ri! - 344 



Vir. On the Alum Mines of Aubin, in the Depaii:ment of the Aveyron : by 

 Mr. L. Cordier, Engineer in Chief, &c. - - . 352 



Vni. The Croonian Lecture, on some Physiological Researches respecting the 

 Influence of the Brain on the Action of the Heart, and on the Generation of 

 animal Heat. By Mr. B. C. Brodie, F. R. S. - - - 359 



FX. Notes by Mr. J. H. Hasaenfratz on the Disoxidation of Oxide of Iron by 

 Uidrogen Gas. - - - - - 370 



X. Determination of the Quantity of Hidrogen and of Ammonia contained 

 in the Amalgam of Ammonia: by Messrs. Gay-Lussac and Thenard. 380 



XT. On the Decomposition of some vegetable or animal Substances subjected to 

 the Action of H^at: by Mr. Gay-Lussac. - s 382 



XII. Renjark on Mr. Moore*s Paper on the Motion of Rockets, In a Letter 

 from a Correspondent. - - - - 384 



Index ---*.- 3&5 



