120 Progress of the Trigonometrical Survey. [No. 2, 
son has supplied some interesting information regarding the hill 
tribes inhabiting Independent Tipperah, which I have extracted from 
Mr. Rossenrode’s report and given in the foot notes. 
18. The BompBay Pparty,* under the superintendence of Lieutenant 
now Captain C. T. Haig, Bombay Engineers, Ist Assistant, was 
engaged in 1860-61, in completing the triangulation necessary to 
connect the Guzerat longitudinal series, on the parallel of 23°, with 
the Singi meridional series, which had been brought up from Bom- 
bay as far as Surat, by Captain Rivers, some years previously. The 
connexion was satisfactorily accomplished, notwithstanding that the 
section of the party employed in selecting stations, got entangled in 
some malarious jungles, where both Europeans and Natives were at- 
tacked with jungle fever, and had to retire to Broach until the sickly 
season was over. In 1861-62, the Guzerat longitudinal series was 
extended eastwards to the Khanpisura series on the meridian of 75°, 
and a series of triangles on the meridian of Oodipoor was carried 
between it and the Karachi longitudinal, thus completing the trian- 
gulation of the northern portion of the Bombay Presidency. The 
principal operations involve 125 miles of triangles arranged in a 
double series, and about 190 miles arranged singly, the total number 
of triangles being 42, covering an area of 7,450 square miles. 
19. The LEVELLING OPERATIONS,f under Captain Branfill, of the 
* Astronomical observations for azimuth were taken at two stations. 
Of the Meridional Series, south of Oodipoor, Captain Haig reports as follows. 
“The country through which this series runs is inhabited by the wildest set of 
savages that 1 have as yet ever had to do with. ‘The thieves (who form a por- 
tion of the inhabitants of every village) for the sake of the clothes a man has on 
his back, assault him; if he attempts to escape, they bring him down with a 
shower of arrows, utterly regardless of his life. On this account, communication 
by messengers was attended with great risk, and consequently Messrs. Dacosta 
and McGill were each unacquainted with the other’s progress until they actually 
met, otherwise I had intended them to be in frequent communication. It is 
partly due to this that the Series has a bend in the centre, and partly because 
the Rajah of Saloomber, a very refractory chief, would not permit a Station to 
be built on his hills, although directed to do so by the Political Agent.”’ 
Mr. Dacosta was employed in carrying a Secondary Series of triangles along 
the west coast of the Gulf of Bombay, from the mouth of the Saburmuthee 
river to Gogo, over a flat tract of country, which for a great portion of the year 
is entirely under water. Also in selecting principal stations for the Mangalore 
and Oodipoor Series, over a meridional distance of upwards of 180 miles. He 
laid out a Secondary Series down the east coast of the Gulf of Cambay as far as 
Surat, and carried other triangles to fix the position of Baroda. 
y+ During the course of the levelling operations, it has often been noticed that 
though the independent results obtained at each station by the respective ob- 
servers differ if at all by almost imperceptibly minute quantities, the differences 
have a tendency to go all one way, and have occasionally accumulated to large 
