PRO 
399 
Prism. An account of two giants caufeways, or groups 
of prifmatic bafaltine columns, and other 
volcanic concretions in theVene ian State in 
Italy ; with fome remarks on the characters of 
thofe and other fimilar bodies, and on the 
phyfical geography of the countries in which 
they are found - Strange 
— — Account of a new inftrument for meafuringr 
fmall angles called the prifmatic micrometer 
Majkelyne 
Problem. See Math maths 
Proboscis. Microfcopical obfervations on the pro- 
bofcis of fleas - - Leeuwenhoek 
Projectiles. A difcourfe concerning gravity and 
its properties, wherein the dcfcent of heavy 
bodies, and the motion of projects, is briefly, 
but fully handled ; together with the folution 
of a problem of great ufe in gunnery 
Halhy 
— Some propofltions on the parabolic motion of 
projediles written in 1710 - Laylor 
— — The motion of projectiles near the earth’s fur- 
face confidered, independent of the properties 
of the comc-feCtions - Simp/on 
Propagation. Letter concerning the feeds of plants, 
with obfervations on the manner of the propa 
gation of p'ants and animals Leeuwenhoek 
— ■ «■ Some microfcopical obfervations and curious 
remarks on the vegetation and exceeding quick 
propagation of moldinefs on the fubflance of 
a melon - - Bradley 
A letter concerning the propagation of milleto 
Barn 
Proportion. An account of the feveral fpecies of 
infinite quantity, and of the proportions they 
bear one to the other - Haley 
— — An account of the proportion of the Englifh and 
French meafures and weights from the ftandard 
of the fame, kept at the Royal Society Anon. 
— Experiments and obfervations on the agreement 
between the fpecific gravities of the fevera! me 
tals, and their colours, when united toglafs, 
as well as thofe of their other preparations 
Delava 
- Obfervations for fettling the proportion which 
the decreafe of heat bears to the height of litua 
tion - Heherden 
E e e 
Tranf. 
Abridg. 
LXV s 
LX VII 799 
XXV 2305 
V 2 267 
XVI 3 
1 472 
XXXI 151 
VI 299 
XLV 137 
X 196 
XVII 700 
III 685 
XI X 490 
IV 2 308 
XXXIV 215 
VI 2 348 
XVII 556 
1 
I 102 
XLII iSs 
IX489 
LV 10 
LV 126 
P R0“ 
