CHEMICAL BASIS 01 1111. ANIMAL BODY 



When monochromatic light (of the spe< trum) is used, 

 found that tin- yellowish-green, i. e. the region most str 

 absorbed by the pigment, is most, active, followed seriati:. 



., blue, greenish-yellow, yellow, violet, orange, and red: the 

 ultra-iv.l r.iys have no such bleaching power. At low tem- 

 peratures the effect of light is less, increases with rise of 

 ature. and at 75 the colour is destroyed even without 

 to light. 



A' fun i of reagents. The colour is at once destroy, -d by tin- 

 action of caustic alkalis, most acids, alcohols, chloroform, and 

 ether: it is on the other hand persistent in presence of ami: 

 solutions of ordinary alum, of sodium chloride, carbonates of the 

 alkalis, and a large number of other salts. One of the most im- 

 portant factors in determining the bleachii ual-purple ly 

 either light or heat is the presence or absence ,f water. If the 

 entire retina be dried in vacuo over sulphuric acid, or if a solution 

 of the lenient be similarly evaporated to d: he visual 

 jairple is comparatively resistent to the action of light, although 

 bleached by a sufficiently prolonged exposure. 



LIPOCHROMES OR LI I KINS 



r the rupture of the ovarian follicle which accompanies the 

 discharge "f nu ovum, the cavity of the follicle becomes tilled 

 with a" mass of cells, traversed by ingrowth- of connecti\e \ 

 from tbe neighboring stroma. and frequently contains 

 re-lilting from ha-morrhage at the time of rupture $ '.'.".4 Thi- 

 is followed, most strikingly if impregnation of tl 

 ovum takes place, by a fatty degeneration of the contained 

 resulting in the formation -f a bright jugmentrd n. bril- 



liant yell..w or orange colour, while at the same time the coluur- 

 inu'-matter ,if the blood may be converted into tl; linn- 



substance already described under the name ha matoidin (p. 'J 



being identical with bilirubin The structure which i 

 from the al.ove rhaiii."-- i< km-wn as a 'mrpus biteiim. I 



(1868) examination o! n.i..nred extract* of tl 



l.-d to erroneous -tateni.-iit- of the identity of the pi-mei/ 

 t. ,ined from them with h;i-mat..idin. a \ie\v \\hi.-h \\a- ilfflOl 

 immediately mntrM-d, while the cul.iuring matt- ! the 



nan f ha molutcin. A renewed inve-tigat imi of tl. 



Thudichum ' to charactefwe n u 



highly coloured fatty COnatitttenti as of butter 



and of some vegetable tissues, and to give it the name lutcin. under 



t Centralb.f. d. med. W>tt 18*9,B. I. 



