[31.] Theor. VIII. Prop. VIII.

[32.] Theor. IX. Prop. IX.

[33.] Problema I. Prop. X. Peripheriæ ad diametrum rationem invenire quamlibet veræ propinquam.

[34.] Problema II. Prop. XI.

[35.] Aliter.

[36.] Aliter.

[37.] Problbma III. Prop. XII. Dato arcui cuicunque rectam æqualem ſumere.

[38.] Theor. X. Prop. XIII.

[39.] Lemma.

[40.] Theor. XI. Prop. XIV.

[41.] Theor. XII. Prop. XV.

[42.] Theor. XIII. Prop. XVI.

[43.] Theorema XIV. Propos. XVII.

[44.] Theor. XV. Propos. XVIII.

[45.] Theor. XVI. Propos. XIX.

[46.] Problema IV. Propos. XX.

[47.] Christiani Hugenii C. F. ILLVSTRIVM QVORVNDAM PROBLEMATVM CONSTRVCTIONES. Probl. I. Datam ſphæram plano ſecare, ut portiones inter ſe rationem habeant datam.

[48.] LEMMA.

[49.] Probl. II. Cubum invenire dati cubi duplum.

[50.] Probl. III. Datis duabus rectis duas medias propor-tionales invenire.

[51.] ALITER.

[52.] ALITER.

[53.] Probl. IV.

[54.] Probl. V.

[55.] Probl. VI.

[56.] Probl. VII.

[57.] Utrumque præcedentium Aliter.

[58.] Probl. VIII. In Conchoide linea invenire confinia flexus contrarii.

[59.] FINIS.

[60.] DE CIRCULI ET HYPERBOLÆ QUADRATURA CONTROVERSIA.