104 



THE MICROSCOPIST. 



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

 Acid will restore the former spectrum. 



Dissolve haematin in water with a little caustic potash. 



A a B 



I li ; ! 



Alkaline Haeinatiu. 



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 



JT TT' 



Reduced Ha^matin. 



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

 with air will restore the former spectrum. 



L/utein Spectra. The juice of the corpora lutea, to which 

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



Juice of (Joipora 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. 



