[101.] EXPERIMENTUM LXXX.

[102.] CAPUT TERTIUM. De Directione Magnetis & Ferri ſuper ipſo ducti.

[103.] EXPERIMENTUM LXXXI.

[104.] EXPERIMENTUM LXXXII.

[105.] EXPERIMENTUM LXXXIII.

[106.] EXPERIMENTUM LXXXIV.

[107.] EXPERIMENTUM LXXXV.

[108.] EXPERIMENTUM LXXXVI.

[109.] EXPERIMENTUM LXXXVII.

[110.] EXPERIMENTUM LXXXVIII.

[111.] EXPERIMENTUM LXXXIX.

[112.] EXPERIMENTUM XC.

[113.] EXPERIMENTUM XCI.

[114.] EXPERIMENTUM XCII.

[115.] EXPERIMENTUM XCIII.

[116.] EXPERIMENTUM XCIV.

[117.] EXPERIMENTUM XCV.

[118.] EXPERIMENTUM XCVI.

[119.] EXPERIMENTUM XCVII.

[120.] Tabula Declinationis Acus Magneticæ Pariſiis obſervatæ.

[121.] EXPERIMENTUM XCVIII.

[122.] DE ACU INCLINATORIA.

[123.] EXPERIMENTUM XCIX.

[124.] EXPERIMENTUM. C.

[125.] EXPERIMENTUM CI.

[126.] EXPERIMENTUM CII.

[127.] EXPERIMENTUM. CIII.

[128.] DISSERTATIO

[129.] EXPERIMENTUM CIV.

[130.] EXPERIMENTUM CV.