22 Rev. O. Fisher on Deflexions — 
the foot of the slope to the southern edge of the plain in the 
meridian of Kalianpur is fairly well accounted for by the 
hypothesis of general isostacy of the area as a whole. 
It must be remembered that certain gratuitous hypotheses 
have been made, which will affect the quantitative, though 
not the. qualitative, results of this investigation. Such are 
the relative densities of the crust and substratum and the 
thickness of the crust. But the quantitative agreement of 
the results with the observed facts shows that the ances 
made are not very improbable. 
Addendum. 
The above calculations have been made on the hypothesis 
that the “cross-section of the outer. Himalayan Ranges,” 
prefixed to the Report, had been taken at right angles 
to their direction, whereas it is really on the meridzan of 
77° 25’. According to the maps, the range in this meridian 
appears to be inclined at about 40° to the prime vertical. 
Since then the length of the meridian cross-section is 124 
miles, the section perpendicular to the range will. be about 
95 miles. On this more correct hypothesis I have recalculated 
the deflexion at the foot of the range. 
The deflexion at 60 miles distance from it might be 
similarly recalculated, if thought desirable. 
The deflexion due to the plains will not be altered. 
The deflexions which follow are referred to the meridian, 
and therefore are immediately comparable with those given 
in the table following p. 14 of Major Burrard’s Report. 
The meridian deflexion at the foot of the slope, due to the 
slope and plateau, recalculated on the present hypothesis, 
is (0254, whereas Major Burrard’s estimate, as already 
mentioned, is 72". This shows that the hypothesis nearly 
reproduces the correct attraction. 
The negative meridian deflexion at the foot of the slope, 
due to the roots of the slope and plateau, will be 53446 ; 
leaving a balance of 18/348 northward at the foot of the 
slope. Add to this a meridian deflexion northward due to 
the plains of 3/830, and we have on the whole 22’°178 
northward at the foot of the slope. The southern deflexion 
in the meridian at the further edge of the plains is 1/"776. 
Hence the total difference of meridian deflexion at the 
foot of the slope, as compared with that at the edge of the 
plains, is 23’"954. The observed difference, as already stated, 
is about 30”. <A closer agreement could hardly be expected ; 
somé of the discrepancy being due to the assumptions re- 
garding the magnitude and form of the highlands, which, 
