104 
THE ANTARCTIC MANUAL. 
chloride of sodium the rise may amount to as much as 8°°45 C. at 
the sea-level; and in the course of experiments made in Switzerland 
it has been found to fall to 8°-0 C. at a height of 2770 metres above 
the sea. If, however, we represent by ¢ the boiling temperature of 
the saturated solution, and 7’ the boiling-point of pure water at P, 
the barometric pressure at the moment: then, if p be the barometric 
pressure under which pure water would boil at temperature t, the 
ratio p: P appears to be constant, and equal to 1°345. 
Tapie VIL—Givina THE Bomine Temperature oF Pure Water, and the TemPrra- 
runnor A Bowing Mrxture or Stream AND CHLORIDE oF Sopium, for Barometric 
Pressures between 550 and 770 Millimetres. 
A ‘emperature of Tension of Saturated Temperature of Rise of Boiling- 
mprmtre’ | Sarees” | OT Seam of | log | satis Nac 
P. 7. p= 1345 P. t. t—T. 
Millimetres °C. Millimetres °C. °C. 
770 100°37 1035°6 108°89 8°51 
760 100°00 1022°15 108°50 8:50 
750 99°63 1008°7 108°11 8°48 
740 99°26 995° 25 107°72 8°46 
730 98°88 981°8 107°32 8°44 
720 98°49 968°35 106:92 8°43 
710 98°11 954°9 106°51 8°40 
700 97°71 941°45 106°10 8:39 
690 97°32 928-0 105°68 8°36 
680 96°92 914°55 105°26 8°34 
670 96°51 901-1 104-83 8°32 
660 96°10 887°65 104°40 8°30 
650 95°68 874°2 103-96 8°28 
640 95°26 860°75 103°51 8°25 
630 94°83 847°3 103-07 8:24 
620 94°40 833° 85 102°61 8°21 
610 93°96 820°4 102°15 8:19 
600 93°51 806°95 101°68 8°17 
590 93°06 793°5 101°21 8°15 
580 92°60 780°05 100°73 8°13 
570 92°13 766°4 100° 24 8°11 
560 91°66 753°15 99°75 8°09 
550 91°18 739°7 99°24 8-06 
In Table VII. we find the barometric pressure (P), given for every 
tenth millimetre from 770 to 550 mm., and the corresponding tem- 
perature of saturated steam (7); under (¢), the temperature of a 
