CO 



Nuuiadzu, using 97 stations. T'nforlunately he lias not juililished any dftailcl 

 occonnt of the measurement. I am imlehteil for the facts wliieh I give to a ])a|)i'f 

 by Mr. Knipping in the 11th Heft of the Mittheilnngen der Deutsclien Gesell- 

 schaft &c. Mr. Stewart found a result of 123()4 ft. (37G8 metres) and estimated 

 his probable error at 20 ft. 



From luy own examination of another omnimeter I am lead to believe that 

 Mr. Stewart's estimate of the probable error is too small; in fact, I lielieve that 

 if tlie instrument were used with ordinary care, the proliable error would be 

 nearer 50 ft. than 20 ft. ; yet, in the absence of a detailed account of the measure- 

 raent, it is only possible to guess at Mr. Stewarts error. 



IV. ]\Iessrs. K. Nakamura and Y. Wada of the Surveying Bureau accom- 

 panied Prof. Mendenhall's party to the summit of Fujinoyama in the summer of 

 1880, and took barometric observations for determining the height of the mountain. 

 The lower station was at Hara, at a distance of about 13 miles in a direction 

 S. 12- E. from the summit, and at a height of 3 ft. above the sea-level. Tiieir 

 observations w'ere taken hoinly from G A.M. to G P.M. during two days, and 

 included observations nn the liuniidity of the air. After the completion of the 

 work, as well as liefore leaving Tokio, the instruments used were all compared 

 with standard instruments in Tokio, and the proper corrections for instrumental 

 error were applied tu the observations. 



Messrs. Nakauun-a and Wada have given their observations and the result 

 of their calculations of the height in the Echo du .lapon, October IGth 1880. 

 They have used Williamson's formula and tables, and have found as the mean of 

 all the results 3823 metres. 



Mr. Nojiri has recalculated the height from data furnished by Messrs. Naka- 

 mura and Wada, and <ibtained the following results in feet;— 



6 A.M. 

 12311 



7 A.M 

 12377 



8 A.M. 9 

 12532 1 



A.M 

 2593 



10 A.M 

 12608 



11A.M. 



12577 



12 M. 



12G08 



1 P.M 



12G3G 



2 P.M. 3 P.M. 

 12591 12602 





4 P..M. 

 12G30 



5 P.M. G P.M. 

 12555 12480 



The mean of tliese numbers is 12515 or 3812 metres. The difference 

 between this result and that of Messrs. Nakamura and Wada arises from the 

 fact that in the two calculations dift'erent tables for atmospheric humidity l-.ave 

 been used. 



V. The other measurements given in the tal ile have been made, some of them 

 w ith aneroid barometers, some by comparing the height of the barometric column 

 on the mountain with the mean height of the barometer at the sea-level; and each 

 of them depends upon a single observation. They are therefore of little weight 

 compared with an extensive set of simultaneous observations with mercurial 

 barometeiT?. 



