316 POWER OF DISTINGUISHING COLOURS. 
observed she had nearly lost the use of her antennx, 
though the rest of the body was as usual. She would 
take no food. Next day I tried again to feed her ; but 
the head seemed dead, though she could still move her 
legs, wings, and abdomen. The following day I offered 
her food for the last time ; but both head and thorax 
were dead or paralysed; she could but move her tail, 
a last token, as I could almost fancy, of gratitude and 
affection. As far as I could judge, her death was quite 
painless; and she now occupies a place in the British 
Museum. 
Power of distinguishing Colours. 
As regards colours, I satisfied myself that wasps are 
capable of distinguishing colour, though they do not 
seem so much guided by it as bees are. 
July 25.—At 7 a.m. I marked a common worker 
wasp (Vespa vulgaris), and placed her to some honey 
on a piece of green paper 7 inches hy 43. She worked 
with great industry. After she had got well used to the 
green paper I moved it 18 inches off, putting some 
other honey on blue paper where the green had pre- 
viously been. She returned to the blue. I then replaced 
the green paper for an hour, during which she visited 
it several times, after which I moved it 18 inches, as 
before, and put brick-red paper in its place. She returned 
to the brick-red paper. But although this experiment 
indicates that this wasp was -ess strongly affected by 
