The Emersion of the Imagines 23 



numerous. Each class of gall requires some variation in its 

 treatment, as compared with that of another kind. Some galls 

 may be put in a box with a glass lid ; others must have earth 

 for the larva; to pupate in ; some require a bag of leno of 

 very fine mesh tied over the twig ; other imagines are captured 

 best in a lamp-chimney, with leno or tulle stretched across one 

 opening, the galled leaves or twigs being placed in the other 

 end, both then being stood in a glass of water. Some galls 

 require the influence of the atmosphere, and must be kept out 

 of doors ; to other kinds this is quite immaterial. Very small 

 galls may be put in glass phials, kept in an upright position 

 by being sunk in a block of wood, as shown in the centre of 

 the illustration (plate 7). 



In every case it is necessary to put a label in the bottle, 

 box, or jar, with the date when the specimen was placed there 

 and other items of reference. They must be examined each 

 day, and upon the first sign of decay, or growth of fungus 

 (which has the unfortunate habit of appearing when least 

 expected and of growing very rapidly), they must be removed, 

 and various expedients adopted to prevent the galls becoming 

 useless. 



