17 



This result is somewlnt gvoatL-r than the gene nil Iv acsepteil ilen.sity, hut 

 considering the great uncertainty of some of the data, its close agreement must 

 be regarded as remarkable. 



It is believed that the density of the m.)U[itaia is the most uncertain of all 

 the factors involved in the calculation, aad it will be of int-Tcst to reverse the 

 problem and, assuming the well established density of 5.G7, according to B.iily, 

 determine the mean density of the mountain by combining this with the results 

 of the [Xjndulum experiments. When this is done the res\ilt is, — 



cl = 2.03 



Now when the influence of the pressure to which much of tlie riiek is 

 subjected is considered, it seems liighly | roluble ih.at, if the m i<s of the moun- 

 tain were continuous througliout. its mean density would be much higher than 

 2.08 and that it might, indeed, be higher than 2. .5. Even after allowing for 

 considerable errors in the penlulnm exiierim^-nts an 1 in the meisurement of the 

 mountain, the results seem to indicate that the mountain is deficient in attrac- 

 tion and they may thus serve a iisefnl purpose in throwing some light on the 

 possilile internal structure of the vole mo. 



Note. Since the printing of the above, Professor Chiiplin has completed a di.scns.sioii of the 

 height of I'ujinoyaina, based u].on ,t11 observat.ons yet made which niny be considered reliable, 

 both barometrical and trigonometrical. The refull of thi.« di.«cnssion gives fur the height of the 

 mountain 37tr2 metres, or 1"24!1 feet, which is slightly mure than 2 3.3 miles. The detail.s of this 

 discussion will be found in No 7 of the .Memoirs of the Science Department of the Tokio Üaigaku, — 

 " Meteorology of Tokio for the Year 1880. ' ' 



