CHEMICAL AND PHYSICAL NOTES. 175 
TaBLe XXVI. 
| | | Temperature 
se ee | Time. | "~~ | Difference. 
Pee At hotel. 
°o a °° a 
| m. : 
Pontresina | 1800 10.0 17:0 2: me 
' 2100 10.50 16°5 19°5 3:0 
2250 aS Ee) 165 j 20°0 3°5 
2370 11.35 165 | 205 | 4-0 
2670 12.0 14°50 | 20°75 6°25 
_ 2790 12.30 13°3 21°0 vied 
2970 1.6 14°0 21°5 75 
3180 1.30 13°1 22°0 8-9 
Summit. ‘ 3266 2.10 11:0 ae a 
_ 2.40 10°5 22-0 11°25 
“Excepting in the first interval the rate of fall of temperature 
between Pontresina and the station on the mountain is less than 
1° per hundred metres. At the summit the mean temperature of the 
dry bulb was 10°°75, and of the wet bulb 6°°45, whence we have the 
vapour tension 4°5 mm. and the relative humidity 47. The weather 
was of the same kind as in the valley, abnormally warm, and the air 
very dry.” 
Conelusion.—It will be observed that in this chapter no attempt 
is made to give instructions to the Chemist and Physicist. Here 
and there a lead in one direction or another is suggested. He must 
rely on his own knowledge and experimental ability. Questions or 
problems which excite his curiosity should be worked out in his own 
way. If, in this way, he answers or solves them to his own satisfac- 
tion, it is probable that he has made a genuine addition to knowledge. 
In all his work it will be useful for him to remember that, primarily, 
Physics and Chemistry are branches of Natural History. 
