C 6i 5 ] 
Star . Agronomical obfervations on the periodical ftar in Collo Ceti, p. 338. Proof of 
the change in the magnitude of the fixed, from £ ceti being much larger than u. p. 
339. Definition of the apparent diameter of a, 340. 
Sugar-mills, The firfr, made without any fixed principles, p. 318. See Cazaud. 
T. 
Theories . Doubts conceived with regard to fome medical, p. 163.- 
Theorems . Ufeful ones in Logarithms, p. 308. Theorems for deriving the logarithms 
of great fractions from thofe of fmall ones, p. 3 12. 
Thermometer . A table- of the. greateft, leafi, and mean heights of, at Fort St. George, 
from March, 1777, to May, 1778, p.268. Regifler of, at Lyndon, in 1779, 
p. 474. Thermometrical obfervatioqs made at Senegambia in 1778, 1779, 
p. 492. Experiments on the greater degree of heat fhewn by one with a blackened 
bulb, p. 582. 584. Way of graduating fome, ibid. Painted black, ftiew a greater 
degree of heat when expofed to the ftrong day-light, p. 384. Experiments on fome 
painted of different colours, p. 588. How to conflruft the feales of fome, p. 390. 
Thermometrical experiments made at Glafgow, p. 431. See Meteorology .. 
Thoracic duft, Account of an oflification of the, p. 323., 
Tbumberg , Dr. Journal kept by him during his refidence at Japan, p. 143.. 
Ticunas (the poifon of). Experiments made with it, p. 163... Its. vapours not 
noxious, p. 167. Its chemical analyfis,. ibid.. Not hurtful when applied to the 
eyes, p. 169. Experiments on rabbits with it r p. 170. Is a poifon when fwallowed in 
large quantities, p. 17 1. Farther experiments on its a6tivity, p. 172. Experiments 
on it applied to the fkin flightly wounded .with a lancet, p. 173. Experiments with it 
on Guinea-pigs and pigeons, p. 170. 174. Sometimes proves fatal when the fkin is 
flightly wounded, p. 176. Experiment on the quantity neceffary to kill an animal, 
p. 176. 178. Experiments on it infufed into the crefts or ears of animals, p. 178. 
Is fatal when applied to the mufcles, p. 179. Its action when mixed with mineral 
acids, p. 181. And with vinegar and rum, p. 182.. Suppofed to be rendered in- 
noxious by mineral acids, p. 183. But not by alkalies, ibid. Acids no remedy 
againfi; it, p. 184. Experiments on the time it takes to diffufe. itfelf through the 
body, p. 183. Its effects on cold-blooded animals, p. 188. Experiments to deter- 
mine what parts of bodies are affe&ed by it, p. 190. Its efle&s on the blood, p. 
19 1. 193. Produces a material alteration in the lungs, p. 194. 
Tobacco . Experiments made on animals with the oil of, p. 209. 
Tornadoes . Suppofed to bring fome peftiferous qualities with them, p. 481. 
Trees . Efficacy of the leaves of, in improving the air, conje£hired, p. 361, And mode 
of afeertaining it propofed, p. 361. 
Tropea . One at Naples during an eruption of Mount Vefuvius, p. 53, 
Van 
