( wea) 
greenish ; seven out of eight of those on yellow paper, and all 
the eleven on orange leno were green ; of seven in absolute 
darkness six were green, two much spotted with dark brown, 
one bone-coloured with much spotting. He also exhibited 
28 pupe of P. brassice and about 40 of P. rape, with results 
in accordance with those obtained and recorded by Prof. 
Poulton. In the case of both these species he had some con- 
fined during the whole period of susceptibility to clear glass, 
with no substances near that reflected any colours or white or 
black ; the results very nearly resembled some kept in absolute 
darkness, except that those on the clear glass were a little 
darker, One very interesting napi exhibit was that of the sheet 
glass roof of a breeding cage in two compartments, one having 
the interior partly orange and partly yellow, the other black; in 
the orange-yellow compartment 46 had pupated on the roof on 
which orange leno had been placed, transmitting orange light, 
and all but four of these were green with very little dark 
spotting ; in the other compartment 34 had pupated on the 
glass roof which had been covered outside with opaque black 
paper and all of them were bone-coloured, most of them much 
spotted with dark brown. He thought it was impossible to 
doubt that much of the colouring was protective. 
Mr. Bateson said that he had lately bred P. napi on a large 
scale, and as regards that species he could quite confirm 
Mr. Merrifield’s observations. His own experiments had been 
undertaken with a different object, but he had frequently 
noticed that there was a fairly close correspondence between 
the colour of the pup and that of the substances to which 
they were attached, though exceptions to this rule were not 
uncommon. He had moreover observed that in this respect 
there was considerable difference between different families of 
larvee. In his experiments the offspring of each pair were 
kept separate, and in some families many larvee pupated on 
the food plant, while in others scarcely any did so. In some 
families the pupal colours conformed in nearly every case, 
while in other families the unconforming pupz were numerous, 
The pupz were often clustered together in little groups, and 
individuals composing such clusters sometimes agreed with 
each other in conforming or in not conforming. 
