»t •

167. Caufa continuati motus projeCtorum eftimpetus a projiciente productus in cor-pore mobili.

168. Caufa motiis reflexi eft tum impetus pri-mo produCtus, tum elafticitas mobilis ,tum durities obicis impertranfibdis :

169. Refracti vero caufa eft obex pertranfi-bilis.

170. Angulus incidentiee eft aequalis angulo re-flexionis, perfe, & quoad fenfum.

171. Caufa accelerationis motus eft impetusfucceflive auCtus.

172. Acceleratio motus crefcit per numerosimpares.

173. Pendulum per motum ofcillationis perfe afeendit ad eandem altitudinem, ex quadefeendit.

174. Grave horizontaliter aut obliqui excuftfum deferibit quoad fenfum parabolam.

175. Non datur morus AttraCtionis Newro-tonianus.

176. Ut corpus grave non labatur, oportetlineam directionis intra baftmejus cadere.

577. Gravia inaequalia ex diftantijs inaequali-bus fufpenfa aequilibrant, fl pondera, &celeritates reciprocent.

178. Quo major eft diftantia potentia motri-cis ab hypomocbho feu fulcro di liantia pon-deris elevandi, eo majus pondus elevat.

179. Augmentum virium in veCte provenit arejectione ponderis in hypomochlion.