122 
PROCEEDINGS OF THE NATURAL [April, 18" ' 
hours that we watched them. They had already learned , ' 
properties of glass. After watching them for some days we 
pushed the window entirely open so that all the glass was out 
of sight and let it remain so for ten or twelve days. At the end 
Qf this time we closed it entirely and stood by to watch the re¬ 
sult. The wasps, on returning, flew toward the window but 
seemed to understand at once the futility of trying to force a 
passage in that direction and buzzed upwards and sideways, 
close to the wall, thus working toward the roof. Thev were evi¬ 
dently looking for an opening and they all eventually found a 
space through which they could pass just below the roof. They 
seemed to know where the nest was located on the other side of 
the wall, for by far the greater number (out of about two hun¬ 
dred wasps) passed in just opposite to it, only a few entering at 
a distance. After watching the wasps for an hour and a half we 
cone u e t at they remembered the characteristics of glass for 
at least ten days. We found, as did Sir John Lubbock, that 
then- memory varied greatly in different individuals. In our 
the° r mi?t n T fl tS ^ rePeat6dly n ° ticed that ^ny wasps made 
f "f mt ° the Wr ° n S hole several times while 
hover oT t % U ° nCe ’ and sti11 others would only 
wou d ™ t Z + ^ rememb «'ing their former mistakes, 
would turn to the true opening. 
emotions. 
Lubbock. 0 Wasps geem to have^ut^h^f 66 ^ ^ “ 
ing of their fellows. To be sure whe 8ym ^ th y for the suffer ' 
and painted them within the cage 
clean each other, and this seems to show thaTth T £ 
sue to aid and comfort their friend^ S 7‘“T' 
them continue to eat, with entire WC have ° fteU 86 
one of their number that l j • com P osure > near the body of 
they frequently fall upon a Sad^? m t0 ^ 
it into the nest to feed their young a™’ ^ * UP ’ and ^ t 
utility is probably the cause nf it ove rpowering sense of 
this cambal propensity; as was 
