114 Progress of the Trigonometrical Survey. [No. 2, 
which there was no means of clearing away without the assistance 
of the villagers, all of whom had absconded. 
8. Fortunately, such interruptions are of rare occurrence, only 
happening in the unusually lawless districts around Hyderabad. 
The operations proceeded without further opposition or hindrance, 
excepting from the physical difficulties of the ground passed over.— 
The district between the Godavery and Kishna rivers was crossed, 
with considerable trouble, owing to the absence of high hills, and the 
undulating nature of the ground, which was all the more difficult 
because covered with dense jungle. ‘Thus the selection of stations in 
such a manner as to form an unbroken chain of quadrilaterals and 
polygons, became a very tedious and laborious undertaking, involving 
the repeated rejection of positions which at first promised the requi- 
site visibility in all directions, but were afterwards found to be defi- 
cient in some essential relation. Nevertheless, in the two field seasons 
the principal triangulation was carried a distance of upwards of 180 
miles. It has now reached a point in the Guntoor district near the 
meridian of Madras, whence it will merge into the meridional are 
which is intended te connect Jubbulpore and Madras, and to be ex- 
tended southwards into Ceylon. 
9. After completing his triangles thus far, Captain Basevi return- 
ed to Vizagapatam, to select a site for the base line of verification, 
which it is proposed to measure in this neighbourhood. He succeed- 
ed in obtaining a suitable site, but not until his field operations had 
been so leng protracted that it was the middle of June before he 
could break up his camp and return to quarters. In the event of 
Captain Smyth’s expedition into Central India taking place, Captain 
Basevi has been nominated to accompany it in the capacity of Astro- 
nomer and Topographer. 
10. The Indus SERr=s, running parallel to the western frontier of 
British India, was completed by the close of the field season 1859-60, 
when the late Surveyor General decided on carrying an oblique series 
along the south east bank of the Sutlej, from Mitunkote to Firozpore, 
to tie up the Punjab meridional series, and form a basis for future trian- 
gulation into the deserts of Sind and Rajpootana. Certain small por- 
tions of the Indus triangulation which had been executed with a two- 
foot theodolite gave unusually large re-entering errors. Lieutenants 
Herschel and Thuillier, both of the Bengal Engineers, and first As- 
