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VI. Agenda, or a Collection of Objervations and Refearchaty 
the Refults of which mey ferve as the Foundation for & 
Theory of the Earth. By M. Dz SAUSSUBE, > 
[Continued from page 359 of the Jat Volume. ] 
CHAP. XXI. 
RefaroBig to be made in regard to the Loadfione, 
Wey, 
, : ) 
a; Tue theory of the loadftone ought to form a part of 
the theory of the earth, becaufe the phenomena which de- 
pend on it belong to the whole globe; and becaufe Halley, 
and after him other philofophers, have endeavoured to ex- 
plain the different phenomena of the magnet by fuppofing 
the earth to be hollow, and that it contains in its cavity one 
or more magnetic globes. 
2. In confidering the load{tone it ought firft to be exa- 
mined whether, in order to explain its phenomena, we 
ought, like Defcartes, to fuppofe a clofe fluid moving ina 
vortex around the magnet, and entering at one of its Bales 
and iffuing at the other; or, as M. /Epinus, a difcrete fluid, 
fufceptible of rarefaction and condenfation, which is rarefied 
in one of the poles and condenfed in the other; or, laflly, 
Satyr. p. 103 Pliny the elder (74 years after J.C.), Hitt. Nat. edit. Bafif 
1525, fol. Lib, LV. cap. 12.p. 6c; Papinius Statius (85 years after J.C.), 
Sylv. Lib. V. p.83. edit. Am/?, 16245; Tacitus (97 years afier J-C,), De 
moribus Germanorum, cap-2. 4.5; Pliny the younger (99 years after 
J. C.), in Panegyr.cap.12; Plutarch (101 years after J.C.); De fuviis, 
Tom. II. p. 1156. edit, Frankf. 1620, p. 949; L. A. Florus (102 years 
after J. C.), Lib. IV. cap. 12. edit, E/xev. 1610, p. 440; Appianus (130 
years after J], C.), Excerpta ex ejus Celticis a Valefio, p, 1220; Paufanias 
(174 years after J.C.), Arcad. cap. xvii. p, 634. edit. Leip 1696, fol.; 
Dio Caffius (238 years after J.C.), Hift. Lib, XLIX, p. 413. edite 
Hazov. 1606, fol.; Herodian (229 years after J. C.), Hift. edit. Uxron, 
Gr. & Lat. 1699.8- Lib. I. p. 12. Lib. VI. p. 2213 Juftin (250 years after 
J.C.), Hiftor, T. I. cap. ii. p. 25. edit. E/x. 1664; Ammianus Marcel- 
Jinus (370 years after J. C.), Lib, XIX. cap.113 Jorvandes (25 years 
after J. C.), De rebus Geticis, cap. liv. p. 693. edit. Am/ff. 16553 Xiphi- 
Jinus (1083 years after J.C.), in Epir. Dionis Caffii, Libs LAVIIL, 
p- 774) and Lib. LXXI. Ps SO4. 
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