20 ANIMAL INTELLIGENCE. 



to show that the rhizopod distinguishes the presence of 

 the sawdust outside the watch-glass, and crawls over the 

 brim of the latter in order to get into more congenial 

 quarters, while it is contented with the water in the watch- 

 glass so long as there is no sawdust outside. But to pro- 

 ceed: 



On one occasion, while investigating the nature of some 

 large, transparent, spore-like elliptical cells (fungal?) whose 

 protoplasm was rotating, while it was at the same time charged 

 with triangular grains of starch, I observed some actinophorous 

 rhizopods creeping about them, which had similarly shaped 

 grains of starch in their interior ; and having determined the 

 nature of these grains in both by the addition of iodine, I 

 cleansed the glasses, and placed under the microscope a new 

 portion of the sediment from the basin containing these cells and 

 actinophryans for further examination, when I observed one of 

 the spore-like cells had become ruptured, and that a portion of 

 its protoplasm, charged with the triangular starch -grains, was 

 slightly protruding through the crevice. It then struck me 

 that the actinophryans had obtained their starch-grains from 

 this source ; and while looking at the ruptured cell, an acti- 

 nophrys made its appearance, and creeping round the cell, at 

 last arrived at the crevice, from which it extricated one of the 

 grains of starch mentioned, and then crept off to a good dis- 

 tance. Presently, however, it returned to the same cell ; and 

 although there were now no more starch-grains protruding, the 

 actinophrys managed again to extract one from the interior 

 through the crevice. All this was repeated several times, 

 showing that the actinophrys instinctively knew that those were 

 nutritious grains, that they were contained in this cell, and 

 that, although each time after incepting a grain it went away 

 to some distance, it knew how to find its way back to the cell 

 again which furnished this nutriment. 



On another occasion I saw an actinophrys station itself 

 close to a ripe spore-cell of pythium, which was situated upon 

 a filament of Spirogyra crassa ; and as the young ciliated 

 monadic germs issued forth, one after another, from the dehis- 

 cent spore-cell, the actinophrys remained by it and caught 

 every one of them, even to the last, when it retired to another 

 part of the field, as if instinctively conscious that there was 

 nothing more to be got at the old place. 



But by far the greatest feat of this kind that ever presented 

 itself to me was the catching of a young acineta by an old 



