INDEX 
TO THE 
PHILOSOPHICAL TRANSACTIONS 
FOR THE YEAR 1799. 
A page 
AciD ofborax, on the decomposition of, - 56 
— — gallic , on the quantity contained in the bark of various 
trees, - - - - - 259 
Air , on an unusual horizontal refraction of it, - - 13 
Algebraic equations, on the resolution of them, - - 265 
■■ — on the resolution of those of particular degrees, 281 
Altitudes of the sun , method of finding the latitude of a place by 
two, - - - ~ “74 
Apple , experiments on its fecundation, - - - 201 
Asterias , experiments on, - - - - 323 
Atmosphere, on the variations to which its lower parts are subject, 13 
Auriga, on the stars in, - - 121,138 
B 
Balance , method used to determine the accuracy of one, - 183 
Bark, on the quantity of tanning principle and gallic acid con- 
tained in that of various trees, - - - 259 
Barker, Thomas, Esq. Abstract of a register of the barometer, 
thermometer, and rain, at Lyndon, in Rutland, 1797. With 
some remarks on the recovery of injured trees, - 24 
Barometer , register of, at Lyndon, in Rutland, - 24 
Biggin, George, Esq. Experiments to determine the quantity of 
tanning principle and gallic acid contained in the bark of various 
trees, - - ' - 
Z z 
2,59 
