37 ^ 
PEN 
PEP 
cerning the going of a 
termine 
length 
clock’s motion, occasioned by the action of 
heat and cold upon the rod of the pendulum 
Pendulum. An account of fome obfervations made 
in London by Mr. Graham, and at Black 
River, in Jamaica, by Colin Campbell, con 
lg of a clock, in order to de 
the difference between the 
of ifochronal pendulums in thofe places 
Graham , Campbell , and Bra ley 
■ Experiments concerning the vibrations of pen 
dulums - - Derham 
. — - An account of the influence which two pendu 
lum clocks were obferved to have upon each 
other - - Ellcott 
Further obfervations and experiments 
El icott 
n. — — A commentary of fome new obfervations to dis- 
cover whethe<“ pendulums are obflrudted by any 
centrifugal force - - Polenu s 
• Two methods by which the irregularity of the 
motion of a clock ariflng from the influence 
of heat and cold upon the rod of the pendu 
lum may be prevented - Ellicot 
■ Letter concerning the inventor of the contri- 
vance in the pendulum of a clock to preve 
the irregularities of its motion by heat anc 
cold - - Short 
— See Clock 
Penguin. An account of the different fpecies of the 
birds called penguins - - Pennant 
Penis. An account of an extraordinary flux of the 
blood by the penis - Howman 
Pennatula Phosphorea. An account of the fea 
pen, or pennatula phofphorea of Linnaeus ; 
like wife a defer iption of a new fpecies of fea 
pen found on the coaft of South Carolina, 
with obfervations on fea pens in general 
EUls 
Pen-Park-Hole. A defeription of Pen-Park-Hole, 
in Gloucefferfhire - - Southwell 
Pennsylvania. Obfervations on the oyfter banks 
of Pennfylvania - - Bartram 
Pepper. A defeription of an odd kind of mufhroom 
yielding a milky juice, much hotter upon the 
tongue than pepper * Lifter 
Tranf. 
Abridg., 
XXXIV 40 
VI 297 
XXXVIII 
302 
VII 238 
XXXIX 201 
VIII 245 
XLI 126 
■ — 246 
— 128 
XLII 299 
— 250 
XLVII 479 
— 5 i 7 
LVIII 9 i 
XXXII 418 
VII 539 
LIU 419 
XIII 2 
II 370 
XLIII 157 
XI 860 
VII 5116 
11 623 
Obfer- 
