CHAP. VII.] BACHELOR-SCHOLAR. 209 



am just beginning to make papers for the examination at 

 Cheltenham, which I have to conduct about the llth of 

 December. I have also to make papers to polish off my 

 pups. with. I have been spinning colours a great deal, 

 and have got most accurate results, proving that ordinary 

 peoples' eyes are all made alike, though some are better 

 than others, and that other people see two colours instead 

 of three ; but all those who do so agree amongst themselves. 

 I have made a triangle of colours by which you may make 

 out everything. 



You see that W lies outside the triangle B, K, Y, so that 

 White can't be 

 made with Blue, 

 Ked, and Yellow ; 

 but if you mix 

 blue and yellow 

 you don't get 

 green, but pink 

 a colour between W and K. Those who see two colours 

 only distinguish blue and yellow, but not red and green: for 

 instance 



6 of blue and 94 of red make a red which looks to 

 them like a gray made of 10 W and 90 Black. 



40 of blue and 60 of green make 34 of W and 66 Black, 



I should like you to find out if the Normans have got 

 Bishop Percy's JReliques of Ancient Ballad Poetry, for if they 

 have I would not send them a duplicate ; if not I think the 

 book would suit one-half of that family. 



If you can find out any people in Edinburgh who do 

 not see colours (I know the Dicksons don't), pray drop a 

 hint that I would like to see them. I have put one here 

 up to a dodge by which he distinguishes colours without 

 fail. I have also constructed a pair of squinting spectacles, 

 and am beginning operations on a squinting man. 



To C. J. MONRO, Esq. 



18 India Street, Edinburgh, 19th Feb. /55. 

 My steps will be no more by the reedy and crooked 



