Tiii CONTENTS. 



SUPPLEMENT TO VOL. XXV. 



Engravings of the following Subjects : 1 . Lieutenant Spratt's Homograph ; 2. Mr, 

 White's improved File for Letters, Receipts, &c. ; 3. Diagrams illustrative of 

 certain Properties of Solids, by John Gough, Esq. ; 4. Captain Bolton's Method 

 of Rigging iiis Jury Mast, and setting up a Ship's lower Rigging, 



L An Inqttiry, Geometrical and Arithmetical, into certain Properties of Solids 

 in general, and of the five regular Bodies in particular. By John Gough, Esq. 



321 



H. Invention of a Homograph, or Method of Communication by Signals, on 

 Sea or Land. By Lieutenant James Spratt, of the Royal Navy - 325 



III. Description of an improved File for Receipts and Letters. By Richard 

 White, Esq., of Essex-Street - - - - 330 



IV. On Respiration. By William Allen, Esq. F. R. S., and Williarn Haseldine 

 Pepys, Esq., F, R. S. - - - - - 331 



y. MeHioiT on Prussic Acid. By Mr. R. Porrett, Junr. of the Tovi^er 344 



VL On the Oxides of Iron, and the Manner in which they comport themselves 

 ■with some Acids. By Mr. Bucholz - - _ 353 



VII. Letter from Captain William Bolton of the Royal Navy, on his improved 

 Jury Masts, and on a Contrivance for better securing the Shrouds of Ships 



337 



VIII. On a native Arseniate of Lead. By (he Rev. William Gregor. Com- 

 municated by Charles Hatchctt, Esq., F. R. S. - - 360 



IX. Experiments on the Combination of Phosphorus with Metals, and their 

 Oxides, in the humid Way ; to which is added the Examination of a Gas 

 arising from a peculiar Decomposition of Alcohol: by Mr. Theodore de 

 Grotthuss - - - . . - 368 



X. Report made to the Physical and Mathematical Class of the French Institute 

 on a Burning Mirror presented to the Class by Mr. Peyrard - S77 



XI. Analysis of the Bronzite, by Mr. Klaproth - - 381 



XII. Extract from a Letter of Mr. Gehlen, on the Analysis of the Kannelstein 

 ^d Greenla»d Garnet, on some Metallic Succinates, &c. - 383 



