194 THE PEAKS AND MOUNTAIN RANGES

tions have been made from immense distances, and sre consequently liable to certain errors which have been discussed by Colonel Burrard.

It was observed from the following stations :—

Station. Height above Sea. Distance. — Shangruti . . tw 17,531 789 Biachuthusa . . . 16,746 99-0 Marshala . . . 16,906 58-6 Kastor . . . 15,983 66:0 Thorigo . wt. 17,246 61:8 Haramokh . . 16,001 1865 Kanuri-Nar. «Sts 15,437 1143 Barwai . . . 16,304 88 Thalanka . . « 16,830 74-7

And apart from the errors due to distance there are others which must always be counted on. As he remarks, no telescope is absolutely perfect ; no level is entirely trustworthy; no instrumental graduations are strictly exact; and no observer is infallible. Then, again, the peaks themselves do not always have clearly defined summits, though K? happens in this respect to be a model for observation, and as it has been observed on several occasions from different stations, the errors in the mean value of height due to faults of observation are, probably, in Colonel Burrard’s opinion, less than ten feet. Another source of error is the