272 CAPTAIN W. DE W. ABNEY ON THE COLOUK 



Slits at SSNs 240 and 205 to match 236. 



But 

 Therefore 



(10) 



236 205 240 



100 = 22-24 + 777G. 



230 



100 = 80-50 + 19-50. 



240 RS GS 



100 = 74-92 + 25-08. 



The percentage composition of 245 has already been found. 



245 ES GS 



100 = 69-60 + 30-40. 



Slits placed at SSNs 205, 250 and 390. 



ES 250 390 W 



1378 + 84-56 + T66 = 100. 



But 



Therefore 



(11) 



ES GS 390 



68-42 + 29-90 + 1'68 = 100. 



250 ES GS V 



100 = 64-62 + 35-36 + '02. 



In a similar way the following percentages were 



260 ES GS 



(12) 100 = 55-68 + 44-17 



270 ES GS 



(13) 100 = 49-23 + 50-55 



275 RS GS 



(14) 100 = 46-75 + 52-89 



280 'RS GS 



(15) 100 = 4477 + 54-94 



283 ES GS 



(16) 100 = 43-63 + 55-60 



285 RS GS 



(17) 100 = 4271 + 56-37 



288-5 ES GS 



(18) 100 = 41-24 + 57-74 



found. 



V 

 + 15. 



V 

 + '22. 



V 

 + '36. 



V 

 -f '54. 



V 

 -f 77. 



V 

 + '92. 



V 



