SLAVE-MAKING ANTS. 35 



yellow ants return to their ravaged home, 

 and occasionally one comes near the nest of 

 the red warriors, attracted by the sugar and 

 honey with which I keep them supplied. It 

 approaches very timidly even when its own 

 species and the blacks are feeding alone, and 

 runs away each time that an ant turns from 

 the honey to go to the nest, as if afraid of 

 pursuit. And I find that even tbe yellow 

 ants will drive it away if they come in con- 

 tact with it. But on two occasions I saw 

 this yellow ant capture one of its own spe- 

 cies that was feeding and domesticated with 

 the reds, and carry it to its own nest. I 

 think these two ants were nurses that had 

 been so recently captured by the reds, and 

 they were recognized by this yellow worker. 



The black and yellow ants never accom- 

 pany their masters in their raids on other 

 tribes, but stay at home and clear the pas- 

 sages, open and close the entrances, and 

 nurse the young. I tried many experiments 

 to test the intelligence of the ants, which I 

 must omit, as I wish to dwell more especially 

 on the feature of their invasions. 



On the morning of the 18th the soldiers 

 make a long march ; they go directly to a 

 line fence, some thirty yards distant, which 

 separates the grounds from a neighbor's 



