The Contents.

ways whereby it hath been attempted ,particularly by Chymijlry.

Ch. io. Of subterraneous Lamps , di-vers historical relations concerningtheir duration so? many hundred yearstogether.

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Ch. II. Several opinions concerning thenature and reason of these perpetualLamps .

Chap. 12. The most probable conje-cture how these Lamps were fra-med.

Ch. 13. Concerning several attempts ofcontriving a perpetual motion by mag-netical virtues.

Chap. 14. The seeming probabilityof effe 8 ing a continual motion bysolid weigjhts in a hollow wheel orsphere .

Ch. 15