CONTENTS. 
XII. On the Conversion of Animal Muscle into a Substance much 
resembling Spermaceti. By George Smith Gibbes, B. A. of 
Magdalen College, Oxford. Communicated by George Shaw, 
M. D. F. R. S. p 
XIII. Abstract of a Register of the Barometer , Thermometer , 
and Rain, at Lyndon, in Rutland, 1753. By Thomas Barker, 
Esq. Communicated by Sir Joseph Banks, Bart. P.R.S. 
XIV. Observations on some Egyptian Mummies opened in Lon- 
don. By John Frederick Blumenbach, M. D. F. R. S. Ad- 
dressed to Sir Joseph Banks, Bart. P. R. S . p. 177 
XV. Observations on Vision. By David Hosack, M. D, Com- 
municated by George Pearson, M. D. F. R. S. p, 136 
XVI. Dr. Halleys Quadrature of the Circle improved: being 
a Transformation of his Series for that purpose to others 
which converge by the Powers of 80. By the Rev. John Hel- 
hns. Vicar of Potter's- Pury, in Northamptonshire. Commu- 
nicated by Nevil Maskelyne, D.D. F.R.S. and Astrono- 
mer Royal. p 2l// 
XVII. 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 
