CONTENTS 



OP T H B 



FOURTH VOLUME. 



UN the PoJihiUty of Cafual Mulilathrls in ihe Bodies of 

 Animals becoining in the Courje cj- Time hereditary Marks 

 of Dijiin^ion . By Profcffbr Blumenbach Page I 



Report on the Travels of C Oliver and C. Bruguiere, 

 undertaken by order of the French Government, thi-ongb the 

 Ottoman Empire, Egypt, and Perjia, during the Years 

 1793, 93^ 94; 95j 9^ ^"^97 - - 6 



Method oj preparing the Dutch Turnfol Blue - 1 7 



On the apparent Converfon of Silver into Gold. By Pro- 

 feJfor'A\\.V)^^V^X^T,of Erlungen - - 18 



Hijiory of Ajlronomy for the Year 1798. Bead in the College- 

 de France, Nov. 20. 5y Jerome Lalande, InJpcStof 

 and Dean of the College, arid formerly Director of the Oh- 

 fervatory _ _ _ 23 



Progrefs of Dr. Mitchill'j' Mind in invcjligating the 

 Cauje of the r ejlilential Dijlempers which vift the Cities- 

 cf America in Summer and Autumn, Being a Develope- 

 ment of his Theory of t'ejlilential Fluids, as publijhed to 

 the World in 1795, <i7id the fucceeding Years - 35 



On the Ufe of Calcareous Stones in the ManufaBuring of 

 Crtide Iron. By Mr. David Mush et of the Clyde 

 Iron IVorks. Communicated by the Author - 43 



Account of Bugs found in holloiu Trees, with Obfervations 

 on that Phenomenon. i?yS. Oedman - 57 



Obfervations on Animal Ele^ricity • being the Subjlance of 

 two Letters from A. Volt a to Prof for Gren - 59 



Agenda, or a Colle^ion of Obfervations and Rejearches, the 

 Rc/ults of ivhich may Jerve as the Foundation for a Iheory 

 oj the Earth. By M. De Saussure - 68 



Obfervations on the Manufacture of the Acetite of Copper or 

 k'erdigrife, Verdet,&c. .B;'J.A.Chaptal - 71 



On the Method of preparing Tallow Candles with IVooden 

 I'Vicks. By Profcffor M E I> l C U s of I ieidelherg - 79 



Fjxpernnents on the Colouring Matter of l^egctable Juices with . 

 the Tungjti: Acid. By Cit. GvYTOS - 81 



A 2 Defcription 



