276 



Mr. Ivory's Bakerian LecUtre 



Table continued. 



Heights of Places in the Neighbourhood of Lima, observed by 

 the Sympiesometer. 



Names of Places. 



Hour of Temper. 

 Observa. ature. 

 tion. 



1837. 

 Dec. 22. 



23. 

 24.' 



25. 

 26. 



27. 



say. 



Lima to 



Cavalluo 



Hill at Rio Seco 



Santa Rora de Quiveo 



JaSO 



Obragillo 



San Buenaventura 

 Cross above S. Jose 



Huamautanga 



Pumchucu 



Cruz Verde 



Macao 



Pumchanca 



Lima 



lOa.m 

 2 p.m 

 5 a.m. 



10 „ 

 5 „ 

 9 „ 

 noon. 



8 a.m 

 5 „ 



9 „ 

 noon. 

 4 p.m 



Height I 



Hygrometer 

 English Boiling point 

 feet. of water. 



81° 



78 



59 



70 



47 



59 



60 



49 



514 



69 



83 



75 



500 



1,166 



4,704 



3.700 



5,143 



8,944 



8,969 



9,998 



11,270 



8,630 



4,655 



2,248 



853 



500 



Leagues 

 distance. 



15° 208' 



20 2044 

 22 202 



9 

 13 



17 192 



18 195 



28 



21 209 

 14 210 



24 251 

 2428 

 2-1 30^ 



24 



N.B. The hygrometer denotes the degree of cold necessary to produce 

 the dew-point. 



XLIV. The Bakerian Lecture. — On the Theory of the Astro- 

 720t)iical Refractions. By James Ivory, K.H., M.A., 

 F.R.S. L. 4' E., Ifistit, Reg. Sc. Paris, Corresp. et Reg. Sc. 

 Gotlin. Corresp.* 



^ I "'HE apparent displacement of the stars caused by the in- 

 -*• flection of light in its passage through the atmosphere, 

 is treated by the astronomer like most other irregularities 

 which he has occasion to consider. A set of mean quantities 



* From the Philosophical Transactions for 1838, Part ii. 



