Pro P R I E T A T E Lu C I S. … Sit vas parallelepipedum aqua plenum A E I Y. Ocu- lus in O pofitus rem in E fitamnon videbit in loco fuo , fcd altius , nempe in G. Q^amobrem in aqua alius eft radius verus A E, alius adparens A G. In reliquis qui ad perpendiculum non infpiciuntur , eadem omnino eft ra- tio. Sit enim res oblique…
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