(° My) 
Poulton in his ample paper on the subject, which was read 
before the Royal Society last year, and recently published in 
the Philosophical Transactions of that Society; and to effect 
such test different and additional influences were adopted, 
so that an analogy might be drawn between the two sets of 
results. 
Previous observers had freely stated that it was the habit of 
chrysalides to assume the precise colouration of whatever 
surface they were attached to, and the untested facts 
of the case had been considerably exaggerated. Professor 
Meldola, however, had modified such statements by declaring 
that in the process of pigmentation there was no analogous 
relation whatever to external photographic agency, the action 
of light upon the sensitive skin of a pupa being of a special 
nature altogether. The conclusions drawn by Mr. Poulton 
from very extensive practical tests fully bore out the truth of 
Prof. Meldola’s opinion, and it was interesting to apply 
additional experiments to the point. 
Between 80 and 90 larvee were employed by Mr. Griffiths 
in these experiments, and of this number 74 pupz resulted 
which were properly available for precise analytical treat- 
ment. These were spread over a series of four orders of 
condition, namely :—The influence of ‘Single Colours ”’ 
proper; ‘‘ Parti-colour”’ tests (of secondary importance) ; 
‘True Conflicting-colour’”’ experiments; and ‘ Miscel- 
laneous ” conditions. 
Mr. White said the methods of analysis, and standards of 
estimation which had been devised by Mr. Poulton in the 
course of his researches, were closely adhered to throughout 
Mr. Griffith's experiments, so that a true comparison of 
the results of the two series of experiments might be duly 
made. Mr. White further acknowledged his indebtedness to 
Mr. Poulton for the personal aid he had afforded him in the 
classification of the pupe. 
The range of colours employed as influences included 
black, white, blue (two shades), pink, red, yellow, green, 
gold, &c. 
An important point in relation to the period when the 
pigment is chiefly developed in pupe, had been discovered 
