iv CONTENTS. 



VI. On the ProcelTes for manufafturing Hats, the Ufe of Machines, and other 

 Objeas. By N. L. - - - - p. 73 



Pradticability of machines for hat-making. Particular ufes of dregs of beer in that art. Applicatiorif' 

 of heat, Conftruftion of the bow. Impofitions and diflionefty of the workmen. General remarks. 



VII. Account of a Subftance found in a Clay-pit, and of the Effefts of the Mere 

 of Difs upon various Subftances immerfed in it. By Mr. Benjamin Wifeman, 

 of Difs in Norfolk. With an Analyfis of the Water of the faid Merc, by 

 Charles Hatchetr, Efq. F.R.S. in a Letter to the Right Honourable Sir Jof. 

 Banks, Bart. K.B. P.R.S. Sec. - - - p. ^J 



Inflammable mineral. Various fubftances expofed to the water of Difs Mere. Analyfis of the water, and 

 examination of thofe fubftances. Formation of Pyrites. 



VIII. Ab^raft of Experiments and Obfervations on the internal Ufe of Phof- 

 phorus. By Alphonfus Leroi, Profeflbr at the School of Medicine in Paris. 



p. 85 



Phofphoms is found to ftimulate or increafe the powers of life and mufcular energy. Various fafls. 

 Oxide of iron with phofphorus. Intimation of certain remarkable experiments, faid to have been 

 made with phofphorus. 



IX. Letter of Enquiry refpe£ling the proper Form of a Boiler for Steam- 

 engines. - - - - - p. 86 



Defcription of the ufual form of a boiler for fteam. Objeftions to the depth of its contents. Re- 

 marks on the efFedls of fuch depth, and the general production of fteam. 



X. Defcription of the Furnace for converting Bar 'iron into Steel. By Mr. 

 Jofeph Collier. - - - - p. 88 



XI. On the Origin of the i!\reometer. By Citizen Eufebe Salverte. p. 89 



XII. Chemical Confiderations on the Ufe of the Oxydes of Iron in the dyeing 

 of Cotton. By J. A. Chaptal. - - - p. 92 



Scientific News, and Account of Books. - - - P- 93 



Refpirabllity of the gafeous Oxide of Azote. — Erratum from the Rev. Mr. Pearfon of Lincoln. — 

 New Produce of European Sugar. — Notice of a Tranflation of Dr. Gren's elementary Treatifc 

 on Chemiftry. — Death of Dr. Frederick Albert Charles Gren. — Communication from Dr. 

 Beddoes. 



JUNE 1799. 



Engravings of the following Objefts : i. Apparatus for afcertaining a ftandard 

 of Weight and Meafurc. 2. Sketches of Barometric and Thermometric Firft- 

 movers. 



I. Account of fome Endeavours to afcertain a Standard of Weight and Meafure. 

 By Sir George Shuckburgh Evelyn, Bart. F.R.S. and A.S, - p. 97 



Short 



