1835.] Lymph, Blood, and Chyle. 21 



pension in the serum, and renders it muddy. The albumen 

 of fresh chyle, like that of the serum of the blood, coagu- 

 lates when a great quantity of caustic potash is added. 



Muller found the globules of the chyle in the cat, dog, 

 &c., spherical, and not flattened. He observed also that 

 they are sometimes smaller than those of the blood, as in 

 the dog ; while, in the cat they are equal in size to those 

 of the blood, and larger, as in the rabbit. He differs from 

 Tiedemann and Gmelin, who consider the white colour of 

 the chyle to be derived from the particles of fat swimming 

 in it, and who say that it becomes transparent when ether 

 quite free from alcohol is added to it. Miiller tried the 

 experiment upon the chyle of the cat, but obtained a diffe- 

 rent result ; for he observed the globules, which had not 

 changed their colour. 



Article IV. 



On Accidental and Complementary Colours. By Charles 

 ToMLiNSON, Esq. 



1. In a letter that I had the pleasure of addressing to the 

 Editor of this Journal, (vol. i. p. 440), I pointed out a ready 

 method of observing the accidental colours of certain 

 chemical solutions by means of mercury, and stated a few 

 results when reddish-purple, red, yellow, and blue solutions 

 were employed. 



2. I should have stated that the best mode of observing 

 these colours is when the finger is placed horizontally, a 

 plane passing through which, and communicating with the 

 opposite part of the periphery of the glass, forms an angle 

 of about 45°, while the eye should form about an equal 

 angle on the other side. 



3. It will naturally be inferred that every coloured solu- 

 tion yields the same accidental or complementary colour, 

 when observed by means of the reflecting surface of mercury, 

 and such, indeed, is the result, provided the solution be 

 sufficiently transparent to allow of two reflections of the 

 periphery of the glass. 



4. I had some difficulty in obtaining a good orange solu- 

 tion, but after repeated trials I succeeded in obtaining an 

 excellent colour, by adding a solution of oxalate of ammonia 

 to a solution of bichromate of potassa. On placing this 



