Eeference numbers 

 of Experiments. 



Pupal Colours. 



(1) (2) (3) (4) (5) Totals 



Kesults compared. 



Black surface in complete darkness. 



Experiments 5 & G 

 18&19 

 46 

 50 



Totals..: 17 



Kesults expressed as 1 ! o,,.^ 

 percentages of total ' 



11-5 



13 



25-0 



3 =19 



17-3 



=16 

 = 4 

 =13 



52 



13-5 



Experiments 51 to 54 I 5 

 100 



Gilt surface in darkness. 

 3 



Totals.. 



Eesults expressed as] ,n.r 

 percentages of total 



8 



29-6 



11-1 



18-5 



22-2 



=rl9 



=. 8 



27 



Experiment 68 was omitted 

 (see description). 



The difference between these 

 results and those produced by 

 black surfaces in strong light is 

 far greater tlian in V. urticce, 

 and resembled the relationship 

 in Piei-is rapcc (Phil. Trans., 

 1887, B, pp. 411—414). The 

 colours of the pupae are very- 

 irregular, and do not rise un- 

 interruptedly to a maximum in 

 some part of the scale. 



Probably some effect was pro- 

 duced by the occasional exposure 

 of the larvas (see account of ex- 

 periments). Allowing for this, 

 the results are very similar to 

 the above, and exhibit the same 

 irregularity. 



Zinc pocket box (darkness). 



Experiment 69 3 



3 =7 



Eesults irregular, as above. 



Black surface in strong light. 



Experiment 1 

 48 

 66 

 88 & 89 



Totals.. 



Eesults expressed as ) 

 pei'centages of total j 



= 2 



=19 



= 6 



1 

 131 



32 



Very uniform results, showing 

 the powerful effect of these con- 

 ditions in producing dark pupcx\ 

 There is one interesting excep- 

 tion. 



Light brown paper in strong light. 



Experiment 86 



=3 



Although the surface was 

 much less dark than the above, 

 its effects were not very diffe- 

 rent. 



White opal glass. 



From this point onwards all 

 the backgrounds were subjected 

 to strong light. 



White surfaces tended strongly 

 to produce the light pupa3, but 

 not so strongly as gilt, although 

 far more so than silver. The 

 white paper and opal glass pro- 

 duced the same effect, corre- 

 sponding to their similar re- 

 flecting powers ; for both of 

 them return the rays from all 

 parts of the spectrum. 



