. Investigation of the Powers of the prismatic Colours to heat and illu- 

 minate Objects ; with Remarks, that prove the different Refrangi- 

 bility of radiant Heat. To which is added, an Inquiry into the 

 Method of viewing the Sun advantageously, with Telescopes of large 

 Apertures and high magnifying Powers. By William Herschel, 

 LL.D. F.R.S. Part I page 20 



- Experiments on the Refrangibility of the invisible Rays of the Sun. 



By William Herschel, LL.D. F.R.S 22 



Experiments on the solar, and on the terrestrial Rays that occasion 

 Heat; with a comparative View of the Laws to which Light and 

 Heat, or rather the Rays which occasion them, are subject, in order 

 to determine whether they are the same, or different. By William 

 Herschel, LL.D. F.R.S 23 



Chemical Experiments on Zoophytes ; with some Observations on the 



component parts of Membrane. By Charles Hatchett, Esq. F.R.S.... 25 

 On the Electricity excited by the mere Contact of conducting Sub- 

 stances of different Kinds. In a Letter from Mr. Alexander Volta, 

 F.R.S. to the Right Hon. Sir Joseph Banks, Bart. K.B. P.R.S. ... 27 



Some Observations on the Head of the Ornithorhynchus paradoxus. 



By Everard Home, Esq. F.R.S 29 



I Experiments on the solar, and on the terrestrial Rays that occasion 

 Heat; with a comparative View of the Laws to which Light and 

 Heat, or rather the Rays which occasion them, are subject, in order 

 to determine whether they are the same, or different. By William 

 Herschel, LL.D. F.R.S. Part II 30 



An Account of the Trigonometrical Survey, carried on in the Years 

 1797, 1798, and 1799, by Order of Marquis Cornwallis. By Capt. 

 William Mudge, F.R.S..: 33 



1801. 



The Croonian Lecture. On the Irritability of Nerves. By Everard 

 Home, Esq. F.R.S page 33 



The Bakerian Lecture. On the Mechanism of the Eye. By Thomas 

 Young, M.D. F.R.S 35 



On the necessary Truth of certain Conclusions obtained by Means of 

 Imaginary Quantities. By Robert Woodhouse, A.M 39 



On the Production of Artificial Cold by Means of Muriate of Lime. 



By Mr. Richard Walker 40 



Account of a monstrous Lamb. In a Letter from Mr. Anthony Car- 

 lisle to the Right Hon. Sir Joseph Banks, Bart. K.B. P.R.S 41 



An Anatomical Description of a male Rhinoceros. By Mr. H. Leigh 

 Thomas,"Surgeon 41 



Demonstration of a Theorem, by which such Portions of the Solidity 

 of a Sphere are assigned as admit an algebraic Expression. By 

 Robert Woodhouse, A.M 42 



Account of the Discovery of Silver in Herland Copper Mine. By 



John Hawkins, Esq 42 



Account of an Elephant's Tusk, in which the Iron Head of a Spear 

 was found imbedded. Bv Mr. Charles Combe 43 



