1879.] Various Altitudes on the Island and Peak of Teneriffe. 515 



Moisture Expired less Atmospheric Humidity Inhaled. 



Stations. 

 . 



Barome- 

 trical 

 pressure. 



Number 

 of experi- 

 ments. 



Mean 

 correction 



for 

 humidity 

 inhaled.* 



Moisture 



corrected 

 for atmo- 

 spheric 

 humidity. 



IVEoistu/rc 

 (corrected) 



t?A. JJ1I CU 



per litre. 





Inches. 



Self 









Summit of Peak, 

 12,200 feet. 



17 -993 



3 



0-043 



0-324 



0-0339 



Alta Vista, 10,700 

 feet. 



20 -513 



38 



036 



314 



-0330 



vxu.cticti.ctj / y\jv\j leer 





99 

 AO 



A *A A A 

 U U4.il> 



"247 



No deter- 



Puerto, seaside . . . 



22 -922 



36 



Owpelin* 



-105 



0-183 



mination. 

 -0237 



Summit of Peak, 

 12,200 feet. 



17 -993 



3 



0-060 



0-459 



0348 1 



It was not without some trouble that a few successful determina- 

 tions of the moisture expired were obtained at the highest point of 

 the Peak, 12,200 feet above the sea. This summit is a cup-shaped 

 depression, about half a mile in diameter, volcanic rocks towering 

 round it. The depth of this crater does not appear to exceed 30 or 

 40 feet, and there is no difficulty in walking across it in any 

 direction. The floor of the crater consists of' a light white sandy 

 material mixed at places with crystals of sulphur, while rocks crop out 

 here and there. There was a great difficulty in finding a spot 

 sheltered from the sun where I could place my balance and sit down 

 to breathe through the tube. At last some shade was obtained for 

 the balance by means of a blanket, and we managed to creep into a 

 narrow place between two rocks, where the sun's rays could not 

 penetrate. The heat was intense, the sun pouring down upon the 

 Peak from a perfectly clear sky, and everything being nearly too hot 

 to be touched, notwithstanding the intense terrestrial radiation at that 

 altitude. Apparently every circumstance combined to baffle my 

 experiments; the balance would not remain in a horizontal position ; a 

 light breeze kept blowing the fine sand about, and I had constantly to 

 remove the beam of the balance to wipe the points of suspension ; 

 then the blanket would not keep in its required position ; and I had 

 to lay down at full length on the hot sand without any shelter from 

 the sun to get through the weighings. 



* Calculated from Grlaisher's Hygrometrical Tables. 



