HALL

letter from M. Reid to D' HaLes, concerning the nature of tar, and a methode of obtaininy . his medical virtues (London, Manby et Cox, 1747).

5. Physico-mechanical experiments, containing useful ma necessary instructions for such as undertake long voyages at Sea (London, 1739. Trad, franc., La Haye, 1740).

6. Philosophical experiments on sea water, Corn, Flesh and other Substances (London, 1739).

7. An account of a useful discovery to distill double the usual quantity of seawater, by blowing showers of air up through the distilling liquor ; and also, to have the water perfectly fresh and good by means of a little Chalk. And an account of the great benefit of ventilators in many instances, in preserving the health and life of people, in slave and other transportships. Also an account ofthe good effect of blowing showers of air up through wilk (London, Manby, 1756).