THE CABBAGE-CATERPILLAR 313 



not drops of honey, in which the puny creatures would 

 get stuck, but little strips of paper spread with that 

 dainty. They come to them, take their' stand on them 

 and refresh themselves. The fare appears to agree with 

 them. With this diet, renewed as the strips dry up, I 

 can keep them in very good condition until the end of 

 my inquisition. 



There is another arrangement to be made. The col- 

 onists in my spare tubes are restless and quick of flight; 

 they will have to be transferred presently to sundry 

 vessels without my risking the loss of a good number, 

 or even the whole lot, a loss which my hands, my forceps 

 and other means of coercion would be unable to prevent 

 by checking the nimble movements of the tiny prisoners. 

 The irresistible attraction of the sunlight comes to my 

 aid. If I lay one of my tubes horizontally on the table, 

 turning one end towards the full light of a sunny win- 

 dow, the captives at once make for the brighter end 

 and play about there for a long while, without seeking 

 to retreat. If I turn the tube in the opposite direction, 

 the crowd immediately shifts its quarters and collects 

 at the other end. The brilliant sunlight is its great joy. 

 With this bait, I can send it whithersoever I please. 



We will therefore place the new receptacle, jar or 

 test-tube, on the table, pointing the closed end towards 

 the window. At its mouth, we open one of the full 

 tubes. No other precaution is needed : even though the 

 mouth leaves a large interval free, the swarm hastens 

 into the lighted chamber. All that remains to be done 

 is to close the apparatus before moving it. The observer 



