e 
88 KE. Loomis—Reduction of Barometric Observations. 
fore explained. In tables X and XI the pressures are given in 
millimeters and the temperatures in centigrade degrees; but 
for convenience of pti arco the results in table III are given 
in English units. The results for barometric minima accord 
temperature of the air column ? In order to decide this ques- 
tion, | have examined the observations cade by Plantamour at 
several stations in the neighborhood of Mt. Blanc and published 
in Mémoires de la Société de Physique de Genéve, volume xv, 
pp. 899-408. The following table gives a summary of the 
results. 
coos astkasal No. of esc anisole es M. temp. 
. ee Obs. en Rare —+4sum. 
POIPAVAL oo devas 840 | 22 16°°41| 17°°88] 5°55 | +0°°57 
Chamounix .... .... 1044 11 12°16} 16°89) 2°44 |+ 0°22 
Evoléna 1379 | 7 11°63} 17°11) 2°43 |+ 0°73 
Bourg St. Pierre _..| 1640 | 22 | 11°16} 17:40} 5°52 |+ 0°44 
Cantine de Proz.... | 1809 ll 12°39| 19°24! 9°60 |— 0°14 
Column first gives the name of the station; column second 
its altitude in meters; column third the number of sac ew 
made; column four th the mean of the observations made at 
stations named in column first; columns fifth and sixth ihe 
here employed, sities on an average 4°7 hours later than at 
Geneva. St. Bernard is 50 miles east of Geneva and a barome- 
tric minimum ide this distance in three hours, so that at 
St. Bernard the barometric Pa appear to be eae 47 
ours on account of elevation. The discrepancies shown in 
table III are to be citer partly to this retardation but mainly 
to the dissimilarity of the barometric curves at the two stations. 
ap ee a si ag ace 
a: Se 
se alts aa Rei Sr : 
SS ee OR ee Se ee ee ee 
ee ee Se ee 
# 
ee iat oe eae, re, Pe, 
