TABLE OF CONTENTS 



TO THIS EIGHTH VOLUME. 



M A Y, 1804. 



Engravings of the following Objeas : 1. A Machine of confiderable Power, for 

 clearing Roads of Mud, by Dr Winterbottom ; 2. Mr. Robert Green's Hand 

 Drill for Peas; 3. The Rev. E. Cartwright's Three Furrow Plough ; 4. Dia- 

 gram for inveftigating the Figure of the Earth; 5. New Galvanic Apparatus, 

 convertible at Pleafure into one or many Plates; 6. An Hydraulic Machine, 

 operating by the Rotation of two Pinions in a Water Veffel. 



I. Letter from C. Wilkinfon, Efq. on the Means of fimplifying and improving 

 the Galvanic Apparatus . - - - Page 1 



II. Obfervations and Communications on the Dry Rot in Timber, made to the 

 Society for the Encouragement of Arts - - - 5 



III. On the Figure of the Earth. By Peregrinus Proteus - 12 



IV. Defcription and Drawing of a Hand Drill for fowing Peas, Beans, &c. 

 Communicated to the Society of Arts, by the Inventor, Mr. Robert Green, 

 of Weftwratting, Cambridgefhire - - - - 19 



V. Enquiries concerning the Methods of inveftigating the Courfe and Velocities 

 of a Body fuppofed to be projedled from the Moon to the Earth. By a 

 Corrcfpondent - - - - - 22 



VI. Drawing and Defcription of a Three Furrow Plough. By the Rev. Edmund 

 Cartwright, of Woburn, Bedfordlhire - - - 24 



Vir. On the State of Science among the earlier Nations of Antiquity : and more 

 efpecially of thofe Refearches which conftitute the Subjeils of Alchemy. In 

 a Letter from E. P. - - - - - 27 



VIII Defcription of a Machine for clearing great Roads from Mud. Com- 

 municated to the Society of Arts, by the Inventor Dr. John Winterbottom, 

 of Newbury, Berks - - - - - 29 



IX. Defcription and Drawing of an Hydraulic Machine, with an Account of 

 feveral Inventions of early Date, which have been lince brought forward by 

 later Inventors Extracted frona a Foreign Work publifhed early in the laft 

 Century. By a Corrcfpondent - - - - 35 



X. An Examination of Dr. WoUafton's Experimenton his Perifcopic Spectacles. 

 By Mr. W. Jones, F.Am. P. S. - - - - 38 



XI. Experiments and Obfiervations on the Change which the Air of the At- 

 mofphere undergoes by Refpiration, particularly with Regard to the Abforption 

 of Nitrogen. In a Letter from Alexander Henderfon, M. D. - 40 



XII. Obfervations and Experiments tending to afcertain the Caufes of thofe 

 Irregularities in Chronometers, which are generated during Cvonfiderable In- 

 tervals of Time, and have been afcribed to external Caufes. By Mr. J. 

 Haley, Jun. - - - - - - 4S 



XIII. A Memoir concerning the Fafcinating Faculty afcribed to the Rattlefnake 

 and other American Serpents. By Benjamin Smith Barton, M. D. From 

 the American Tranfaftions, Vol. IV. - - - 53 



Scientific News, 62 — Very extenfive Table of Squares, ib. — On Phofphoric Rings. 

 From a Corrcfpondent, R. B. 64. 



JUNE, 



