AND MODERN PHYSICS, 39 



glorious bright patches and networks of blue, yellow, and 

 green, with blood-vessels great and small." 



After the vacation ho returned to Cambridge, and 

 the letters refer to tho colour-top. Thus to Miss Cay, 

 November 24th, 1854, p. SOS : 



" I have been very busy of late With various things, and 

 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 people's 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 trhngle 

 of colours by which you may make out everything. 



44 If you can find out any people in Edinburgh who do not 

 see colours (I know the Dick-sons 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 spectacle*, and am beginning 

 operations on a squinting man." 



A paper written for his own use originally souio 

 timo in 1854, but communicated as a parting gift to 

 his friend Furmr, who was about to become iv master 

 at Marlborough, gives us some insight into his view 

 of life at the age of twenty-three. 



14 lie that would enjoy life and act with freedom must have 

 the work of the day continually before his eyes. Xot yester- 

 day's work, lest he fall into despair ; nor to-morrowX lest he 

 become a visionary not that which ends with the day, which 

 is a worldly work ; nor yet that only which remains to eternity, 

 ' for by it he cannot shape his actions. 



44 Happy is tho man who can recognise in the work of 

 to-day a connected portion of the work of life and an 



