t 3 
the under-flooring, p. 884—890. Of the extra-lathing, p. 890/89!. Of the inte£- 
fecuring, p. 891. Experiments on thefe methods by fire, p. £91 — 893. Trifling ex- 
pence of this method in building, p. 89 
Fijb, experiments on fome, relative to their heat, ,p. 26. Why fifli have recourfe to deep 
waters in winter, p. 32^ 33. Tails of filh frozen, with a view to fee if they would be 
reftored to the a&ions of life when thawed, p. 38. A defcription of the Exococtus 
volitans, or flying-fifh, p. 791 — 800. 
Flooring . Of the under-flooring ufed in fecuring buildings againft fire, p. 884.— 890* 
Trifling expence of it, p. $94. 
-Flowers, the erfe&s of their tffluvia upon air, p.202, 203’. Bad effect of flowers in rooms, 
p. 209. A different property in them in their growing ftate, p. 216. 
Fluid. The conftant laws obferved in the various motions of ele&rical fluid, p. r 032—* 
1036. Remarks concerning it, p. 1036, &c. Obfervations and experiments tending 
to confirm Dr. Ingenhonfz's theory of the Ele&rophoru'S ; and to ftievv the impermeability 
ofglafsto el eftric fluid, p. 1049 — 1053. 
F'ying fjh (Exocoetus volitans), a defcription of it, p. 791— 800. 
Fort Malbro* , in Sumatra, its lituation, p. 16 1, 162. Defcription of the houfes there, 
p. 162. Of the climate, p. 162, 163. Some account of the inhabitants, p. 163, 
164. 
Fort St. George , in the Eaft Indies, a meteorological diary, &c. kept there, p. 180. See 
Meteorological Diary. 
Fofsy a brook near York, fome account of it, p. *96. 
Fountains , hot ones in the ifland of St. Miguel, p. 605, 606. Perfons cured of virulent 
diforders by their waters, p. 607, 608. 
Fowls, experiments on fome, relative to their heat, p. 23, 24, Some degrees warmer 
than quadrupeds, p. 24, 25. 
Franklin , Dr. his aflertion concerning what buildings are fecure from the attacks of 
lightning, p. 239. An inflance to the contrary, p. 240. His do&rine concerning 
fharp-pointed condu&ors confidered, p. 801, Sec, 
Freezing parts of animals, with a view to fee if they would be reflored to the a&ions 6f 
life when thawed, p. 34^38. 
Frere, Mr. John, his letter concerning Mr. Miller’s account of the ifland of Sumatra, 
Enganho, &c. p. 160, 16 r. 
Frog, experiments on one, relative to its heat, p. 26. Why frogs live under large Hones 
in the winter, p. 32, 33. 
Fruit, ripe, the effect o. effluvia from it upon air, p. 207. 
Furnas , a valley in the ifland of St. Migue’, an account of its hot 2nd cold fpring?, p* 
• 604 — 60;. Perfons cured of virulent diforders by thefe waters, p. 607,608. 
6 tl 
Vot, lxviii* 
c, 
