[ I2 4] 
effect us bis e . Similiter patet actionc ter a produci 
debere cffectum ter e, &c. Immo in genere, actione 
na {=A) produci debere effectual ne (=£), Eft 
igitur A : a ; ; E : e, hoc eft, actiones funt in ratione 
cffectuum. 
Theorema 12 noftrum. 
Vires funt in ratione compofita maffarum &cclcri- 
tatum. 
< Demonflratio . 
Per Theorema 4- actiones funt in ratione compo- 
fita temporum & virium. Per Theorema 1 1, eaedem 
funt in ratione effectuum. Ergo effectus funt in ra- 
tione compofita temporum & virium. At per Theo- 
rema 8, effectus funt in ratione compofita maffarum 
atque (patiorum* Ergo ratio compofita temporum et 
virium par eft rationi compofita maffarum atque fpa- 
tiorum. Unde vires funt in ratione compofita maf- 
farum et fpatiorum direde, et temporum reciprocej 
h. e. in ratione compofita maffarum et ceieritatum. 
§>. E . 2 ). 
V. An Account of Two extraordinary Deers 
Horns, found wider-ground in different 
Parts of Yorkfhire ; in a Letter from Mr. 
Tho. Knowlton, to Mr. Mark Catesby, 
F. R. S. 
Read March 13.* | "'H E Head and Horns, which is repre- 
I/45 * ‘ fented in Tab. I. Fig . 2. were found 
in a Sand-bed, in the River Rye> which runs into the 
Derwenty 
$ 
