EFFECT OF BURYING EGG-MASSES 29 
first condition can be obtained. ‘'T'o get data with regard to 
the burrowing powers of freshly-hatched nymphs, experi- 
nents were carried out in the insectary and these have 
shown that the newly-hatched nymphs are particularly 
weak. 
Five glass test tubes were filled with black cotton 
soil; in two of them (a) egg-masses of the Jola Grass- 
hopper were buried at a depth of five inches, in the 
other three (6) at a depth of six inches. The soil was 
lightly pressed down above these masses so as fo repro- 
duce conditions that would occur in the field as closely as 
possible. It retained a good physical texture with ample 
alr spaces. 
The eggs were buried on the 9th August 1910, and the 
nymphs hatched on the 6th to the 9th of September. On 
the 14th September the tubes were examined with the 
following results :— 
Tube a 1—Nymphs all dead ; one has worked its way up two and 
a-half inches. The rest have come up only about 
one inch. 
Tube «a 2—Nymphs all dead; none has come up more than one 
inch. 
Tube 6 1—Nymphs all dead; none has come up more than one 
inch. 
Tube 6 2—Nymphs all dead; a few have worked their way up 
two and a-half inches ; the others are scattered be- 
tween these and the bottom of the tube. 
Tube 6 3—Nymphs all dead; some have got up one and three- 
quarters inches, the rest are scattered between 
them and the bottom of the tube. 
In the case of the last tube, the egg-mass was remov- 
ed practically intact. It had been inserted upside down 
and the nymphs had apparently all emerged through the 
lower (the morphologically upper) end of the mass. 
The experiment on deep ploughing, carried out in a 
badly-infested tract near Honnali, was not on a sufficiently 
large scale to give definite results. In order to obtain 
accurate results, it would be necessary to deep-plough the 
whole of the infested area in a village, otherwise the effect 
of the deep ploughing would be obscured by the migration 
of the grasshoppers from the untreated on to the treated 
portions. On account of the apathy and, at times, the ac- 
tive opposition of the raiyats, only about sixteen acres could 
be ploughed. As careful an observation of the emergence 
