I'.ASIS OF TIM: ANIMAL r.nny. 



set liy tin- fact that, unlike ha-matin, it is ivadily obtained in rrystala. 

 elow.) Tin- ha-iiiiu crvtals sh,,uld ! |i..ilr<l with strong acetic 

 acid, tlii-ii \\a-ht-il with water, ale. .hoi. ami ether, ;ml dissolved in 

 dilute raustir potash. The solution is th-n tillered, precipitated with 

 hydrochloric acid, and washt-d with boiling \\ater until tin- washings 

 an- >hown, a> tested by nitrate !' -il\er. \ l.e free from hydrochloric 

 arid. The residue is tinallv dried l>v prolonged heating to l.'lu 

 150. 



ordinary purposes hiematin is characterised chiefly by the 

 speetroseopie appearances of its solutions. When dissolved in an 

 alkali (ammonia, as in solution (c) above) it shows one absorp- 

 tion band in tin- yellow adjuiniiiLj D t<> the red side of this lin.-, 

 while at the same linn- th.-iv is ^reat absorption at tin- Idin- end 

 of the sjM-ctruni ( Fi^. 37, Nos. 1 and 2). On tivatnirnt with a 

 ivduriim a-. -nt, Stokes' fluid or annnoniuni sulphide, this band is 

 ri'plai-fd by two others in the green, of which the >ne neaiv-t l> 

 is remarkably dense, the other less sharply defined. Very little 

 absorption of the red end is observed while that of the blue is as 

 bt-iore very marked (Fi<{. 37, No. 3). This is the spectrum of 

 Stokes' reduced ha-matin and is identical with that of Hoppe- 

 Seyler's ha-niochroiiH^en. The two substances have usually been 



led as identical, but this is disputed by Hoppe-Seyl. -\ 

 aliove). Alkaline solutions of ha-niatin are strongly dichr.'ie. 

 bein.i,' ruby-red in thick layers and greenish in thin 1 

 viewed by reflected li^ht. 



The arid alcoholic solution of ha-niatin (solution (l>) above) is 

 characterised by <ni>- absolution band between r and />. adjoining 

 <', whose centre is situated at w. L. (140. This baiid is somewhat 

 similar to that of metha'moglobin, but it is le-s dense, and careful 

 observation shows that the centres ( .f the re>p. -live bands do not 

 coincide ( Fiij. 37, Nos. 5 and 4). Acid solutions of ha-niatin are 

 monuclironiatic and of a dull reddish-brown colour. If blood or a 

 strong solution of o\y-ha-moul"bin be made strongly acid by tin- 

 addition of acetic acid the ha-moglobin is decomjM.se.l. ha-matin is 

 B6l free, and if the volution be shaken up with ether and all 



ml, the ether li-es to the surface and is m. coloured 



owing to the presence of hiematin held in solution in the acid ether. 

 This acid ethereal solution shows, in addition to the one band al- 

 ready described as characteristic of ha-matin in an acid solution. 

 three other bands whose positions and relative inten.sitir- are siif- 

 liciently shown in Fi-. -"-T, N< 



Bflematinafl prepared by the method bed above i- usu- 



ally obtained Iv but not crvstalline mass of bhiish-black 



colour and metallic lustre, strongly resembling iodine. When 

 finely powdered it appears d.uk or light-brown according to the 



Ml />/,,, W.-/xi/A/.-<-Vm. Amil. :> Ami l"-i S. 239. SPO al*. 



/ \',Mr. in M:ilv - - C'Aiw. 



I \\\u (1877), p. 485. .Ma.-.Mni.n. ./. tfPkgtb \\. \i I8M. p. 22. 



