CONTENTS. 

 VOL. i. 



1800. 



THE Croonian Lecture. On the Structure and Uses of the Membrana 

 Tympani of the Ear. By Everard Home, Esq. F.R.S page 1 



On the Method of determining, from the real Probabilities of Life, the 

 Values of Contingent Reversions in which three Lives are involved 

 in the Survivorship. By William Morgan, Esq. F.R.S 4 



Abstract of a Register of the Barometer, Thermometer, and Rain, at 

 Lyndon, in Rutland, for the year 1798. By Thomas Barker, Esq. ... 5 



On the Power of penetrating into Space by Telescopes; with a com- 

 parative Determination of the Extent of that Power in natural Vision, 

 and in Telescopes of various Sizes and Constructions ; illustrated by 

 select Observations. By William Herschel, LL.D. F.R.S 5 



A second Appendix to the improved Solution of a Problem in physical 

 Astronomy, inserted in the Philosophical Transactions for the Year 

 1798, containing some further Remarks, and improved Formulae for 

 computing the Coefficients A and B ; by which the arithmetical 

 Work is considerably shortened and facilitated. By the Rev. John 

 Hellins, B.D. F.R.S 7 



Account of a Peculiarity in the Distribution of the Arteries sent to the 

 Limbs of slow-moving Animals ; together with some other similar 

 Facts. In a Letter from Mr. Anthony Carlisle, Surgeon, to John 

 Symmons, Esq. F.R.S 7 



Outlines of Experiments and Inquiries respecting Sound and Light. 

 By Thomas Young, M.D. F.R.S 8 



Observations on the Effects which take place from the Destruction of 

 the Membrana Tympani of the Ear. By Mr. Astley Cooper 10 



Experiments and Observations on the Light which is spontaneously 

 emitted, with some degree of Permanency, from various Bodies. By 

 Nathaniel Hulme, M.D. F.R.S II 



Account of a Series of Experiments, undertaken with the view of de- 

 composing the Muriatic Acid. By Mr. William Henry 14 



On double Images caused by atmospherical Refraction. By William 

 Hyde Wollaston, M.D. F.R.S 16 



On a new fulminating Mercury. By Edward Howard, Esq. F.R.S. ... 18 



