The Hunting Wasps 



dose of ammonia is of a certain strength that 

 the movements fail to reappear; but then the 

 insect is dead, quite dead, for it soon begins 

 to decay. It is impossible therefore to pro- 

 duce complete and persistent paralysis in 

 Beetles that have their ganglia far apart by 

 the same measures which proved so effica- 

 cious in Beetles with ganglia close together: 

 the utmost that we can obtain is a temporary 

 paralysis whose effects pass off within a day. 

 The demonstration is conclusive ; the Cer- 

 ceres that prey on Beetles conform in their 

 selection to what could be taught only 

 by the most learned physiologists and the 

 finest anatomists. One would vainly strive 

 to see no more in this than casual co- 

 incidences : it is not in chance that we shall 

 find the key to such harmonies as these. 



60 



