338 Lieut. J. llersclicl on the Eclipse of August 1868. 



Temperature of the Body at increasing Altitudes during the act 



of ascending. 



Temp, under 

 metres. the tongue. 



About 1350. Blaitiere Waterfall, about 5 hours after) r . r 



breakfast .... (4 minutes' exposure) j 

 About 1500. Fasting (Chablettes) (6 minutes' exposure) 35'3 

 „ Chablettes, after full breakfast . . (4 mi- ( og.e 



mites' exposure) \ 

 2060. Pierre Pointue, 'fasting . . . , (5 minutes' ( qr.c 



exposure) \ 

 2080. Planpraz, about 4 hours after break- 1 o<.c 



fast (4 minutes' exposure) f 



About 2100. Under Pavilion du Mont Frety, fasting I 35 . Q 



(about 5 minutes' exposure) \ 

 About 226.0. Arriving at Pierre a l'echelle, in full di- J or.e 



gestion (6 minutes' exposure) ( 



3050. Arriving at " Grands Millets," fasting. . 35*8 

 3362. Arriving at Col duGcant, fasting . . (over ( 04. r 



5 minutes' exposure) j 

 3900. Arriving at Grand Plateau (Mont Blanc), 



about 100 metres below, fasting. . (6 or > 35'6 

 7 minutes' exposure) ) 

 4000. Immediately on arrival at Grand Plateau, 1 



not walking, fasting (rose very rapidly > 34*5 



to36°-3) ' ) 



4331. Dome du Gouter (Mont Blanc) 34 '6 



Mean 353 



Twelve observations. Lowest temperature 34"*5. 



XL. On that portion of the Report of the Astronomer to the 

 Madras Government on the Eclipse of August 1868 which 

 recounts his Spectroscopic Observations. By J. Herschel, 

 Lieut. R.E.* 



THE instrument used by Mr. Pogson for this portion of bis 

 observations was of the same pattern, it is believed, as 

 that used by the present writer. In the annexed Table the 

 positions of Mr. Pogson* s bright lines are fixed with all the ac- 

 curacy at present attainable, by comparison with data in the 

 writer's possession. 



The first column indicates Fraunhofer's lines. 



The second shows readings taken in the early part of 1868 

 with the Royal Society's spectroscope referred to above. 



The third is deduced from the second by the empirical for- 



* Communicated bv the Author. 



