F R I 
FRO 
— An account of feveral experiments concerning 
the running of water in pipes, as it is retarded 
by fri&ion and intermixed air ; with a defcrip 
tion of a new machine, whereby pipes may be 
cleared of air as the water runs along without 
Hand-pipes, or the help of any hand 
- - Defaguliers 
— An examination of M. Perault’s new-invented 
axis in peritrochio, faid to be void of fri£tion : 
with an experiment to confirm the reafoning 
made upon an axis in peritrochio, firft ufed in 
M. Perault’s manner, then in the common way 
- - Defaguliers 
A farther examination of the above 
— An account of two experiments of the friftion 
of pul lies - Defaguliers 
A method of lefTening the quantity of fri£iion 
in engines - - Fitzgerald 
See Engine . 
Fright. The cafe of Henry Axford, who recover 
ed the ufe of his tongue after having been four 
years dumb, by means of a frightful dream 
- - Squire 
Friuli. Letter concerning the mines of mercury in 
Friuli - - Pope 
— A letter concerning the mines of Friuli; con- 
firming as well the account given on that fub- 
ject, vol. I. p. 2 1, as enlarging the fame with 
fome additions - Brown 
Frogs. The phenomena afforded by them in an ex- 
haufted receiver - BoyU 
— — Anatomical obfervations on the ffruflure of the 
lungs of frogs, tortoifes, Ac. and perfe£ler ani- 
mals - - Jl/falpighi 
— — Obfervations about generation by an animalcula 
of the male feed : animals in the feed of a 
frog : and fome other obfervables in the parts 
of a frog - - Leewenhoek 
• Some obfervations made on the fpawn of frogs, 
and the production of tadpoles therein Waller 
« — ~ Letter on animalcula in the excrements of frogs 
- Leewenhoek 
Frog Fish. Some account of the rana pifcatrix 
- Parfons 
“ A n account of the frog-fifh of Surinam 
~ Edwards 
Tranf. 
XXXIV 77 
XXXVI 222 
— 228 
XXXVII394 
LIII 139 
XLV 148 
I 21 
IV 1080 
V 2015 
VI 2149 
XIII 347 
XVII 523 
XXII 509 
XL VI 126 
LI 653 
*97 
Abridg. 
VI 347 
““ 3 T 7 
— 20 
— 322 
XI 958 
n 577 
— 579 
— 523 
— 817 
nr 684 
11 818 
III 68S 
XI 866. 
Frost* 
