5 TINGING A PPA RAT US OF HUMBLE-BEE. 1 7 5 



needles under an amplification of about 10 diameters in 

 water and using a small camel's-hair pencil to brush away 

 loose matter. 



FIG. 162. 



The wasp may also be pressed into the service of the 

 dissector, and here he will find some remarkable differences 

 over the bee ; the poison-bag is separated from the body of 



