936 The American Naturalist. [November, 
discrimination, but also of affection and solicitude. After the 
snail had made its voyage of discovery, with rare unselfish- 
ness and true affection, it remembered its sick mate and 
returned for it. 
Beneath the pavement in front of my door, a wasp (Vespa 
nigra) has her nest. The entrance to this nest is at the bottom 
of a sulcus formed by two parallel bricks. I rolled a piece of 
paper into a compact wad and placed it between the bricks and 
over the entrance during her absence. When she returned 
she seized the paper with her jaws and forelegs and endeav- 
ored to pull it away. This was prevented by the interposition 
of the brick on which she stood. She then went to the other 
side and tried again. Here she failed for the same reason. 
She then descended into the little gully between the bricks 
and easily removed the wad. When she again left the nest, I 
replaced the paper, and on her return she went through the 
same performance as at first. Again I replaced it, but the 
third time she went at once into the gully and removed the obstruc- 
tion. This she did three times in succession. Comment is 
hardly necessary. The evidences of memory and ratiocination 
are too patent to be denied. Some members of another family, 
distantly related to the Helicidx, the limpets, show evidences 
of intelligence, inasmuch as they have a very accurate mem- 
ory of direction. Limpets, when at rest, live at certain fixed 
domicile When hungry, they leave these homes in search of 
food, but invariably return to them as soon as they have satis- 
fied their hunger. One very pointed instance of this homing 
sense is given by Hawkshaw, a most careful and exact 
observer. A limpet had madea clearing on a sea weed cov- | 
ered block of chalk. In the center of this clearing was a 
pedestal of flint which projected an inch or more. On the top 
of this flint pedestal the limpet had taken up its abode. The 
cleared space had several hollows where the animal could 
have easily sheltered itself, but it preferred to return to its 
exposed home after each of its excursions? 
Not many years ago, a French exhibitor with a oe 
company of fleas passed through the country. These insects 
“Hawkshaw : Journal Linn. Soc., Vol. XIV, p. 406. ' 
