CONTENTS. 



xxtii 



XVI. Obfervations on the Differences which exift between the Acetous and 

 Acetic Acids. By J. A. Chaptal. — ^ — — P- 518 



The acetous and acetic acids are not the fame when equally diluted. The acetous acid contains a larger 

 proportion of carbon. 



Accounts of Books, &c. — — — p. 5^3 



Rollo on diabetes mellltus. Condorcet's method of accounts. On Mr. Lowi-y's ruling machine. 



MARCH 1799. 



Engravings of the following Objefts : A new univerfal Ele£lrometer, by Mr. 

 Cuthbertfon ; and, 2. Configurations of the Cryftals of Corundum Stone from 

 Afia. 



I. An Account of Improvements in eleflrical Batteries^ a Method of augment- 

 ing their Power, with Experiments ; (hewing the proportional Lengths of Wire 

 fufed by different Quantities of Eleftricity, and a Defcription of a new univerfal 

 Eleftrometer. By Mr. John Cuthbertfon, No. 53, Poland-ftrcet, London, 

 1799. _ _ — _ __ p-s^s 



Account of the power of batteries. Mr. Brooke's method of increafing the power of eleftrical jars. 

 Difcovery of a method of producing this efFeft, by rendering them damp, Defcription of a new 

 eleftrometer, which (hews the degree of eleftrization, the repulfive force in weight, and ope- 

 rates of itfelf as a difcharger. Courfe of Experiments on the explofion of wind, by jars, in the 

 dry, and in the damp ftates. Inquiry refpefting the caufe of this efFeft. 



II. Difcovery of Sulphate of Strontan, near Sodbury, in Gloucefterfhire, by G, S. 

 Gibbs, B.M. F.R.S. _ , _ _ p.^^s 



III. On the Corundum Stone from Afia. By the Right Honourable Charles 

 Greville, F.R.S. — — — p. 536 



Great probability that corundum maybe found in Europe. Obfervations on the Hiftory and great 

 utility of Cryftallograpfey, An analytical defcription of the cryftalline forms of corundum, by 

 the Count De Bournon. >- 



IV. On Water- wheels. — ^^ — p, 544 



Obfervations on the power of different Water-wheels, 



V. On the Glafs Trundles of Citizen Renaut; and the Duration of the Teeth 

 ofMill-work. By C. B. — — — p- 546 



VI. On Dr. Parr's Theory of Light and Heat. By a Correfpondent p. ^47 

 Scientific News, and Accounts of Books — — ■ p. 548 



Inftitute of Cairo. An Account of the Operations carried on for accomplifliing a Trigonometrical 

 furvey of England and Wales, from the commencement in 1784, to the end of the year 1796. 

 Public Inflitution for diffufing knowledge and facilitating the general introduftion of ufeful me- 

 'Cfcanical improvements. 



