ADVANCED PHYSIOLOGICAL CHEMISTRY 487 



dissolved in warm water the spectroscopic appearance is different and 

 represented by Figure 277. 4. 



Haematoporphyrin is normally present in very small amount in 

 urine. After certain drugs it may be present m comparatively large 

 amounts. Even in acid urine it is present in the condition in which 

 it shows the so-called alkaline spectrum (p. 199, Fig. 145, 11). 



APPENDIX. 



ANALYTICAL TABLES. 



(OUTLINE or METHOD FOR DETECTION OF VARIOUS PHYSIOLOGICAL CHEMICAL 

 SUBSTANCES IN A MIXTURE.) 



The following Physical Properties should be noted : 



I. Appearance. 



A. Powder. Dust some on to a slide and examine under the 

 microscope for starch grains and crystals. Dissolve some in a 

 suitable solvent 



. Solution. 



1. Opaque may be due to : 



(a) suspended fat globules clear up with ether ; 



(b) certain inorganic salts clear up with mineral acid ; 



(c) certain proteids. 



2. Opalescent may be due to : 



(a) glycogen or starch iodine reaction ; 



(b) certain proteids. 



3. Deeply coloured suspect blood. 



