C 4^4 ) 
for the mod part , for they creep only at the 
bottom of the Water,- there "are many Fifli 
have them double. 
VL De R arione Temporis quo grave labitur 
per redam data duo punda conjungen- 
tem , ad Tempus brevifllmum quo , vi 
gravitatis , tnnCtt ab horum uno ad al- 
terum per arcum Cycloidis. 
Theorema. 
/ in CycloiJe AVD cujm lafis AD eft horizonti 
lO paralkla^ Vertice V Jeorfum fpellante , ex A du- 
catur utcmque re£la AB cycloidi occur r ens B, ex 
quo ducatur rella B C curva Cycloidis B D /» B nor- 
maliSi quam ex A dtmtttatur perpendkularis nUa 
A C . Vko TewpHS quo graie i quiete cadens ex vi 
fua gravitatis decurrit reitam A B, ejfe ad Tempus quo 
perjcurrit Curvam A V B, ficut reHa Ah ad reHam A C. 
Ver B ducatur BL paral^ 
lela Cycloidis axi V E 
BK, laji AD faral- 
lela, occurred axi in G,. 
© circulo fuper Diame- 
trum E V defcrlpto in 
F H, Cyckidi denique 
inK. Ducatur re£ia EF, 
qua ex Cycloidis natura /4* 
ralkla 
