248 J. T. "Walker —On Indian Pendulum Observations. [Nov. 
ally in defect, as compared with the theoretical numbers, at the Indian 
stations, and in excess at the Oceanic. This is what Major Herschel be¬ 
lieves he has met with, in his preliminary investigations of the relations 
between the pendulum observations in India and those in other parts of the 
world. And it explains why in his comparison of observed with calculated 
results, he has referred the Indian results to the equator—instead of to the 
southernmost Indian station, Punnse, as formerly—and has adopted, as a 
provisional basis for conversion, a mean equatorial vibration-number which 
he has derived from other observations than those of the Indian group. 
The alteration of treatment affects the vibration-numbers throughout 
by a constant, the magnitude of which, however, is only 205 vibrations. 
We must look therefore to local rather than to distant causes for an expla¬ 
nation of the magnitudes of the deficiency of gravity which are met with. 
To make this more clear it is desirable to refer the observations once 
more to Punnse, instead of to the equator. Then, ranging the stations in 
order of altitude—from the ocean to the coast line and on to the interior 
of the continent, and finally up to the Himalayas—we have the following 
apparent variations, at all the stations but Ivew, which is so far to the 
north of the others that it can only be compared with them on the supposi¬ 
tion that the value of the ellqfficity employed in the calculation is very 
exact. 
APPARENT VARIATION'S. 
Island Stations. 
Minicoy 
+ 
4-02 
Colaba 
+ 
3-40 
Aden 
+ 
2-34 
Mean 
+ 
3-25 
Coast Stations. 
Punnse 
000 
Kudankolam 
' + 
009 
Alleppy 
+ 
1-44 
Mangalore 
— 
0-59 
Madras 
_ 
0-74 
Cocan ada 
+ 
0-84 
Calcutta 
+ 
l-SS" 
Ismailia 
0.48 
Mean 
+ 
0-24 
Inland Stations l 
than 2000 feet, 
mean 1210. 
Mallapatti — 
1-12 
Pachapaliam — 
1-76 
Namthabad — 
2 89 
ICodangal — 
1-94 
Damargida — 
3-91 
Somtana — 
1-66 
Badgaon — 
1 38 
Ahmadpur — 
Kalianpur — 
1-73 
0-96 
Pahargarh — 
2-95 
U sira — 
0-95 
Datairi — 
105 
Ivaliana — 
3 49 
Nojli — 
4 23 
Meean Meer — 
3 36 
Mean — 
2-27 
Inland Stations between 
2000 and 7000 feet, 
mean 3822. 
Bangalore, South — 3-28 
„ North — 2’79 
Dehra — 8-71 
Mussoorie — 557 
Mean — 5'09 
Himalayan Table-land 
Station 15,400 feet high. 
More — 21-44 
