cis. 85 nempe de quafuperius diximus^quod omnialucida emi- nus vifa fub majori angulo comparcant. In vapore enim ambiente caput cometas flamma acceiifus vapor quoad ipeciem dilatantur. Porro quod nonnunquam curva adpareat h^c coma, & hujus quoque rei manifefta eft ratio. Nempe &hoc cx ambiente… … Jam vero cum cometas, & comas adparentis eadem fit ratio, neceiTario eveniet ut quas fit proportio AC ad D C , eadem quoque fit proportio E C ad F C , d>C G C ad H C , denique B C ad I C. Si itaque cur- vam duxeris lineam quse tranfeat per punda DFHI, illa erit apparentis comae diredio. Atque hasc…
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