175 



NOTES. 



LECTUEE I. 



(*) Page 1. The opening lecture was twice post- 

 poned on account of Dr. Faraday's illness. 



( 2 ) Page 9. Platinum, with one exception the heaviest 

 body known, is 21 J times heavier than water. 



( 3 ) Page 10. Aluminium is 2j 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 a 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 crystallisation. To 

 obtain it the blue sulphate is calcined in an earthen 

 crucible. 



( 6 ) Page 16. Add a little liquid to the marble and de- 

 compose it. Marble is composed of carbonic acid and lime, 



