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Sierra Club Bulletin. 



a rain-gauge, arrived with startling promptness. A 

 thermometer shelter was designed, strong and compact 

 to withstand mountain gales, and with a bottom of slats 

 to permit the easy exit of the snow. After being dis- 

 mantled and properly packed, it was carried, on June 

 24th, like a huge sawbuck, on horseback up the trailless 

 side of the mountain. This initial trip was fraught with 

 adventure on the snow-fields about the summit and dur- 

 ing the all-night retreat, but its favorable issue was wel- 

 comed as an omen of future success. 



The period of maximum and minimum instruments 

 did not long continue, for the minimum furnished read- 

 ings strangely low and impelled the observers to seek 

 more accurate knowledge of the fluctuations of the 

 temperature. 



On October 14th a thermograph and a barograph were 

 installed, capable of recording every fluctuation of tem- 

 perature and air-pressure during a period of eight days, 

 and of indicating by means of a perpendicular stroke the 

 highest and the lowest subsequent temperature and pres- 

 sure. Thus the second period of the observatory's devel- 

 opment began. 



By the aid of colleagues at the university, a continuous 

 record of these two phases of the weather was obtained 

 for a period of six weeks during October and November, 

 and with the aid of Professor J. R. Johnson, an enthusiast 

 newly arrived from Kentucky, bi-weekly trips were made 

 after New Year until the next autumn, when rheuma- 

 tism forced him to retire from continuous service. 



During this period the scientific results were suggestive 

 rather than final, and have been quite fully outlined in 

 the Weather Review of June, 1906.* 



The most important of these observations was the 

 discovery by comparison of the records with those at 

 the central station in Reno, 6,268 feet below, that frost 

 forecasts can probably be made on Mt. Rose from twenty- 



* Weather Review, Vol. XXXIV., No. 6, pp. 255-263: "The Mt. Rose 

 Weather Observatory." 



