CONTENTS. 
XII. A HISTORICAL and Anatomical Description of a doubtful 
amphibious Animal of Germany, called , by Laurenti, Proteus 
Anguinus. By Charles Schreibers, M. D. of Vienna. Com- 
municated by the Right Hon. Sir Joseph Banks, Bart. K. B. 
P. R. S. page 241 
XIII. Observations tending to investigate the Nature of the Sun , 
in order to find the Causes or Symptoms of its variable Emission 
of Light and Heat; with Remarks on the Use that may pos- 
sibly be drawn from Solar Observations. By William Herschel, 
L.L.D. F.R.S. p. 265 
XIV. Observations on the Structure , and Mode of Growth, of the 
grinding Teeth of the Wild Boar, and Animal incognitum . 
By Everard Home, Esq. F.R.S. P 319 
XV. Account of some Experiments on the Ascent of the Sap in 
Trees. In a Letter from Thomas Andrew Knight, Esq. to the 
Right Hon. Sir Joseph Banks, Bart. K. B. P. R. S. p. 333 
XVI. Additional Observations tending to investigate the Symptoms 
of the variable Emission of the Light and Heat of the Sun ; 
with Trials to set aside darkening Glasses , by transmitting the 
Solar Rays through Liquids ; and a few Remarks to remove 
Objections that might be made against some of the Arguments 
contained in the former Paper. By William Herschel, LL. D. 
F.R.S. p. 354, 
