294, B. GRASSI AND A. SANDIAS. 
there so that two could pass simultaneously. This primary 
tunnel, as it may be called, was the only one constructed during 
five days, but it was made to bifurcate by the addition of a 
lateral branch. This came off at an acute angle from near the 
middle of the primary gallery, and ran upwards to terminate 
on the margin of the vessel, where the polished surface began. 
During the next few days the uninhabited part of the rubbish 
was tunnelled with numerous burrows, opening on its upper 
surface by several small holes, some of which were continued 
upwards by tubular chimney-like galleries of different heights 
(the largest measured 5 cm.), vertical or oblique in direction, 
and varying in width, usually just capable of being traversed 
by a single Termite. The free ends of these chimneys were 
sometimes closed, sometimes open, and in that case an inmate 
of the colony would not infrequently peep out as from a watch- 
tower (Pl. 18, fig. 13). 
“ Swarming took place on June Ist. On the following days 
the Termites did very little work, to all appearance. They 
lengthened a chimney and built another gallery like the first, 
but not connected with it and not reaching the lip of the 
vessel ; and lastly, they made an incomplete extension of the 
primary tunnel by carrying it along the junction of the lip and 
the paper. The latter exhibited two fresh holes at this point. 
“One day I destroyed the newly formed section of the 
primary gallery by taking off the paper, which I purposely 
put back so that it did not accurately cover the margin of the 
vessel, but left a gap; next day the primary gallery was con- 
tinued horizontally outwards for about 1 cm. from the margin 
of the vessel ; this new portion did not run on the surface of 
the glass, and, like the chimneys, was tubular instead of being 
semicircular (Pl. 18, fig. 17). A day later it was dismantled 
and destroyed by the Termites; this did not surprise me, 
as I had already observed them make and unmake portions 
of galleries. 
**On June 20th the tops of the chimneys and openings were 
closed up, the galleries were unoccupied, and the whole of the 
colony had once more retired to the bottom of the vessel.” 
