THE MICROSCOPE IN CHEMISTRY. 



103 



bands, it is judged that hamate-crystalline is present in it 

 as such, and not formed from it. By treating a solution 

 of blood which exhibits the two absorption-bands with 

 hydrogen, or with a solution of ferrous sulphate contain- 

 ing tartaric acid and excess of ammonia, taking care to 



A a E C 



H H 1 



Reduced Haeiuatoerystalline. 



exclude the air, the color of the solution changes to pur- 

 ple, and the spectroscope shows only one broad band in- 

 stead of two (Fig 57). Shaking with air will restore the 

 two bands. By treating blood with hydrothion or am- 



FIG. 58. 



A a B C 



E 1) 



H FT 



_. 



Blood treated with. Amni 



monium sulphide, three bands make their appearance, as 

 in Fig. 58. 



Hsematin is seen by the microscope to consist of small 



A n 7? fl 



Four-banded Hsematin. 



rhombic crystals. Dissolved in alcohol and a little sul- 

 phuric acid, the spectrum shows four, and under some 

 circumstances five, bands (Fig. 59). Rendered alkaline 



