C 611 ] 
nafal du&, for the cure of the fifiula lachrymalis, p.242. The properties of one 
for drawing ovals upon paper demonftrated, p. 378. 
Jugular vein. Effefts of the American poifon when introduced through the, p. 193. 
Water of the Lauro-cerafus introduced into the, p. 247. 
La-Lande , Mr. de. His opinion of HeveliusY obfervations on the mountains in the 
moon, p. 31 1. 
Lamp , Effects of the light of a, on thermometers, p. 386. 
Lava, More fubje£t to chryftallife within the bowels of a volcano than after its emillion, 
p. 48. Suppofed to have mounted ten thoufand feet in an eruption of Vefuvius, p. 
57. Uncommon lize of the fragments of, thrown out of Vefuvius, p. 77. Particu- 
larities in that of the eruption of 1779, p. 81. 
Lauro-Cerafus, Experiments on animals with the water of the, p. 210. Means of in- 
creating the activity of the poifon of the water of the, p. 212. Effects of the water 
of the, on the nerves, p. 216. And on the blood, p. 217. 
Layardy Dr. His letter relative to the ditiemper among the horned cattle, p, 536. 
Light . Thermometers, with the balls painted black, fhew a tironger degree of heat 
when expofed to a tirong day-light, p. 584. Every day’s degree of, attended with a 
degree of heat, p. 585. Does not decreafe in the inverfe proportion of the fquare of 
the ditiance, p. 387. Homberg’s pyrophorus not affected by it, p. 392. 
Logarithms, Theorems for computing them, p. ^307. Logarithm of two how com- 
puted, p. 310. The conffrudtion of them may be improved, p. 316. 
Ludlam , Mr. His demonftration of the properties of the engine for turning ovals in 
wood or metal, and of the inftrument for drawing them upon paper, p. 378. 
Lungs, The, materially affe&ed by the poifon of Ticunas, p. 194, 
.. * '■ ■ t r - \ 
M, ‘ 
Macjaity Dr. His account of a mift feen in Scotland, p. 160. 
Manfredonia, Fall of minute afhes there in an eruption of Vefuvius, p. 68. 
Mauriceau brought five or fix puftules of the fmall-pox into the world, p. 137. Mr^ 
Hunter’s opinion of his cafe, ibid. 
Maferes. See Cardan, 
Maupertuis, Mr. His account of the caufes of the periodical appearances of changeable 
Ears not contradi&ed by Mr. Herfchel’s obfervations, p. 338. 
Meady Dr. His opinion of the fmall-pox being communicable to the foetus by the mo- 
ther, p. 139. Hiftory told by him to confirm this opinion, p. 132. 
Medical TranfaHions, A paper in them, mentioned, p. 140* 
VoLt LXX. 4 D 
Metdls, 
