SECTION II. CHEMISTRY. 21 



VI. A MANUSCRIPT NOTE-BOOK 

 containing 



On the fly-leaf Notes of the value, hardness and other qualities 

 of gems. 



pp. 1 to 22, of colours. Articles 1 5 from Boyle's experiments 

 and considerations touching colour, 1664. 



Arts. 6 to 21, experiments with prisms; 22 and 26 on internal 

 reflection at or near the critical angle ; 27 to 43 on effects of thin 

 plates of air between glasses. 



44 47. further experiments with prisms ; 48, colours from 

 admixture; 49, reflection at two contiguous surfaces of glass; 50, 

 colours of thin plates of glass, soap-bubbles, &c. ; 51 53, on colours 

 by internal reflection in spheres of water ; 54, effect of oblique rays 

 on the size of the spot at contact of 2 glasses ; 55, diminished re- 

 flection of glass in water ; 56 and 57, light reflected from powders, 

 &c. ; 58 62, effects of distorting the eye-ball ; 63, coloured im- 

 pressions of objects remaining when the eye is no longer directed 

 to them; 64, on the action of the retina and optic nerve (quoted by 

 Brewster i. 432 from Harris, omitting the last paragraph), and on 

 p. 22, notes of the thickness of vibrations of light. 



p. 22, notes from Boyle on increased sensitiveness of sight and 

 hearing produced by sickness. Of vegetable substances precipitating 

 vitriol black. 



p. 23, a receipt for ink. 



pp. 25 41, extracts from Boyle " on the mechanical origin of 

 Heat and Cold," Oxford, 1675. The observations on p. 25 as to 

 the expansion of glass, and those on the elasticity of springs are 

 not in Boyle on Heat and Cold. The book quoted in the MS. is 

 called the "History of Cold," which is not the title of the 1675 

 edition, but forms part of the title in the collected works. 



p. 45, quotations from Boyle. Some incomplete trials of the 

 height at which a thermometer stands in several substances melting 

 wax, tin, lead, &c. on Mar. 10, 1692 3. An experiment for deter- 

 mining the expansion of air by heat, also that of linseed oil 

 (Brewster, ii. 366). 



p. 49, extracts from Boyle's new experiments touching the spring 

 of the air. At the bottom of this page and on 



p. 50, account of experiments on flame with conclusion that 

 flame and vapour differ only as bodies red-hot and not red-hot. 



