104 



THE MICROSCOPIST. 



by caustic potash, one broad band appears (Fig. 60\ 

 Acid will restore the former spectrum. 



Dissolve haernatin in water with a little caustic potash. 



A a 7? 



JT 77' 



iilii 



Alkaline liaeuialin. 



To a solution of ferrous sulphate, add tartaric acid and 

 then ammonia till alkaline. Pour a little of the clear 

 mixture into the hsematin solution. The spectrum of re- 



A a B C 



Reduced Haematin. 



duced hsematin will show two bands (Fig. 61). Shaking 

 with air will restore the former spectrum. 



Liutein Spectra. The juice of the corpora lutea, to which 

 sulphuric acid and a little sugar is added, gives a fine 



A a E C 



Juice of Corpora Lutea with Sulphuric Acid. 



purple color, and shows in the spectroscope one band in 

 the green (Fig. 62). Its chloroform solution, examined 

 with lime-light, shows two bands in blue (Fig. 63). An 

 alcoholic or ethereal solution gives a third one in the 

 violet. 



