GENERAL CHAEACTEEISTICS. 



21 



tractor linguaa muscle, which, as it contracts, diminishes the 

 space above the salivary valve, and so pumps out the saliva, 

 which mixes with the nectar as it rises, by methods we now 



Fig. 12. 



TONGUE AND APPENDAGES. 



(Magnified. After Barb6.) 



a, tongue ; 6, labial palpi ; c, maxilla. 



understand. Bees, it has often been observed, feed on thick 



syrup slowly; the reason is simple. The thick syrup will not 



pass readily through minute passages without thinning by a 



