138 
PROFESSORS W. RAMSAY AA’D S. TOUXG 
^'hicli boiled almost constantly at 97‘^‘6 (the rise of temperature during distillation 
being less than 0°'l) under a pressure of 763'S mms. This sample was employed for 
the determination of vapour-pressures at low temperatures, and for the constants at 
high temperatures with quantities A, B, and D (see p. 140). 
The specitic grayity of the alcohol was determined seyeral months later, and a fresh 
quantity of the alcohol was prepared from the hydrate into which the greater part 
of the alcohol had been conyerted. The hydrate was treated with dry potassium 
carbonate, when, as described by Chaxcel (Ioc. cit.), two layers were formed, the 
lower one being an aqueous solution of potassium carbonate, the upper one consisting 
of the partially hydrated alcohol. The alcohol was fractionated seyeral times, 
potassium carbonate being each time added to the most yolatile distillate, until a 
quantity was obtained, boiling from 97°T to 97°T5 under a pressure of 752 mms. 
For the determinations of yapour-density at high temperatures with quantity C, the 
alcohol was refractionated. The portion employ ed boiled constantly at 97°T under a 
pressure of 750'6 mms. 
Beduced to 760 mms. these temperatures would be (1) 97°‘45 ; (2) 97‘^'4 ; (3) 97°'4. 
The boiling-point of propyl alcohol has been determined by numerous experi¬ 
menters, and the results obtained by several are very concordant; the most reliable 
appear to be the following : — 
Observer. 
Keferenee. 
Pressure. 
Tempei-ature. 
Temper.vture 
reduced to 
760 lums. 
Bkuhl.... 
■ Aimaleii dei' Ghemie,’ vol. "200, p. 173 . 
752-2 
97-97-2 
97-35 
Zantek . . . 
214, p. 153 . . 
760-0 
97-40 
97-40 
Lina'eaiaax . . 
.. 161. p. 26 . . 
760-0 
97-41 
97-41 
.SCHIEF . . . 
.. 220, p. 101. . 
752-4 
97-10 
97-35 
Koxoavalow . . 
749-2 
97-00 
9i'37 
' 
Pierre and Puchot g'Annales de Chimie,’ vol. 22, 1871, p. 276) found 98°; and 
Perkix (•'Chem. Soc. Trans.,’ yol. 45, p. 446) giyes two determinations: 97°‘5 to 
98°'5 and 98°, but the boiling-point of the alcohol employed in the final determination 
of specific grayity is not stated. 
A/^jK/ratu^' emploi/cd. —The apparatus employed Avas the same as that described in 
our memoir on Ethyl Oxide (*'Phil. Trans.,’ A, 1887, p. 57). 
