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LECTURE I.

($1$) Page 1. The opening lecture was twice postponed on account of Dr. Faraday's illness.

($2$) Page 9. Platinum, with one exception the heaviest body known is 21$1⁄2$ times heavier than water.

($3$) Page 10. Aluminium is 2$1⁄2$ times heavier than water.

($4$) Pages 10 and 11. Power or property in water. This power—the heat by which the water is kept in fluid state, is said, under ordinary circumstances, to be latent or insensible. When, however, the water changes its form, and, by uniting with the lime or sulphate of copper, becomes solid, the heat which retained it in a liquid state is evolved.

($5$) Page 10. Anhydrous sulphate of copper: sulphate of copper deprived of its water of crystalisation. To obtain it the blue sulphate is calcined in an earthen crucible.

($6$) Page 16. Add a little liquid to the marble and decompose it. Marble is composed of carbonic acid and lime,