ANNUAL REGISTER, 110^ 



above, and with its ak and septum 

 below fixed in the incision. A lit- 

 tle terra japonica is softened with 

 watfr, and being spread on slips of 

 doth, five or six of these are placed 

 over each other, to secure the join- 

 ing. No other dressing but this 

 cement is used for four days. It is 

 then removed, and cloths dipped in 

 ghee (a kindot bniter) arc applied. 

 The connecting slips of .skin are di- 

 vided about the 25th day, when a 

 little moredissection is pecessaryto 

 improve the appearance of the new 

 nose. For five or sixdays after the 

 operation, the patient is made to lie 

 on his back; and, on the tenth day, 

 bits of soft cloth are put into the 

 nostrils, to keep them sufficiently 

 open. This operation is very ge- 

 nerally successful. The artificial 

 nose is secure, and looks nearly as 

 well as the natural one ; nor is the 

 scar on the forehead very pbscrvatiie 

 after a length of time. 



An account of some experimf7its upon 

 coloured shadows. By licuteiuaH- 

 general sir Benjamin Thompson, 

 count ofRtmJord, F. R. S. In a 

 letter tosir Joseph Bonis, baronet, 

 P. R. S.from the Philosophical 

 j'rc?isaciicns. 



Dear sir, 



QTNCE my last letter, being ern- 

 i-> ployed in the prosecution of my 

 experiments upon light, I was sirmrk 

 with a very beautiful, and what lo 

 iTic appeared to be a new appear- 

 ance. Desirous tif cc-mpanng the 

 intensity of the light of a clear sky, 

 by day, with that of a common wax 

 candle, [ darkenci wy room, and 

 letting the day-light from the north, 

 coming through a hole near tiie top 



of the window-shutter, fall at an 

 angle of about 70° upon a sheet of 

 very fine white paper, I placed a 

 burning wax candle in such a posi- 

 tion, that its rays fell upon the same 

 paper, and as near as I could guess, 

 in thelineof reflection of the rays of 

 day-lit;ht from wilhoui ; when in^ 

 terpo^ing a cylinder of wood, about 

 ha-If an inch in diameter, before the 

 centre of the paper, and at the dis- 

 tance of about two inches from '\tn 

 suiface, I was much surprised to 

 find that the twoshadows projected 

 by the cylenderupon the paper, in-- 

 stead of b<. ing merely shades vv ithout 

 colour, as I expected, the one of 

 them, that which corresponding 

 with the beam of day-light, was 

 illuminated by the caudle, was yel-^ 

 hit' J while th.e other, correspond- 

 ing to the light of the candle, and 

 consequently illuminatedby thelight 

 of the h( avens,wasofthc most beau^ 

 tifu! /'//a'that it v.as possible to ima- 

 gine. This appearance, which was 

 not only unexpected, but was really 

 in itselfin the highest dcgreestriking 

 and beautiful, I tound, upon repeat-^ 

 cd trials, and after varying the ex- 

 peri^nent iu everyway I could think 

 of, to be so perfectly permanent, 

 that is is ;ib»olutely impossible to 

 produce two shadoA's at the same 

 time from the same body, the one 

 answering to a beam of day-light, 

 a!:d the other to the litht of a can- 

 d!cor lamp, without these shadows 

 being coloured, ihc one yellow, and 

 the other llue. 



The experiment may very easily 

 be made at any time by day, and 

 almost in any place, and even by 

 a person not in the least degree 

 veised in experimental researches. 

 Nothing more is necessary for that 

 purpose than to take a burning can- 

 dle into a darkened room in the day 



lime. 



