PAITERXS CONSPICUOUS IN NATURE. 



Text-fififiire 13 



403 



3 



A 



Objects of the same size but of different shape Ij'ing at the junction of a black and 

 white background as used in Experiment No. 10. 



EXPEEIMENT No. 10. 



The visibility of black objects projecting from the margin of a large black mass. 

 The objects are all of the same size but of different shape, as shown in the text- 

 figure. 

 Experimental conditions : Candles 1 ft. 3 ins. apart and 3 ft. 6 ins. from objects. 



Object no. 1 visible at 57 feet. 



„ „ 2 „ 54 „ 



„ „ 3 „ 'IS'o,, 



„ „ * „ 32 „ 



Compai-e with Experiment No. 5. 



The object may be visible against two or moi'e components of 

 a patterned background, and may be different in tone from 

 either component. 



Text-figure 14. 



/ X 3 



1. A grey disc placed over the junction of a black and white background. If the 

 disc approaches in tone more nearl}^ the white of the background than the black 

 then from a distance it will be seen as in no. 2 ; if more nearly the black, then 

 as in no. 3. 



If a grey disc be placed over a black and white junction, as in 

 text-fig. 14, and be viewed from gradually increasing distances, 



