MOTH-G ATERriLLARS. 



193 



for the outside tlian for the parts of the interior, which it 

 thought necessary to strengthen by fresh additions ; but 

 the chamber was ultimately finished by a fine and closel}^- 

 woven tapestry of silk. We could see the progress of its 

 work, by looking into the opening at either of the ends ; 

 for at this stage of the structure the walls are quite opaque, 

 and the insect concealed. It may be thus observed to 

 turn round, by doubling itself and bringing its head where 

 the tail had just been ; of course, the interior is left 

 wide enough for this purpose, and the centre, indeed, 

 where it turns, is always wider than the extremities. 



(J.R.) 



When the catei'pillar increases in length, it takes care 

 to add to the length of its house, by working-in fresh 



Cases, &c., of the Clothes-Moth (Tinea j^Mionella).— a, CuierpWhxr feeding in a case, 

 which has heen lengthened by ovals of different colours; b, Case cut at the ends for 

 experiment; c, Case cut open by the insect for enlarging it; d, e. The clothes-moths in 

 their perfect state, when, as they cease to eat, they do no further injury. 



hairs at either end ; and if it be shifted to stuffs of dif- 

 ferent colours, it may be made to construct a party- 

 coloured tissue, like a Scotch plaid. Eeaumur cut off" 

 with scissors a portion at each end, to compel the insect 

 to make up the deficiency. But the caterpillar increases 

 in thickness as well as in length, so that, its first house 

 becoming too narrow, it must either enlarge it, or build 

 a new one. It prefers the former as less troublesome, 

 and accomplishes its purpose "as dexterously," says 



