208 BACTERIOLOGICAL AND ENZYME CHEMISTRY 



Group I 



Albumins Proper. These are naturally occurring sub- 

 stances and are all typical colloids : 



1. Serum albumin, lact-albumin, egg-albumin. 



2. Serum globulin, lacto-globulin, cell globulin. 



3. Plant globulins and vitellins. 



4. Fibrinogen. (Occurs in the blood plasma of all verte- 

 brates.) 



5. Myosin and allied substances. (Derived from muscle.) 



6. Phosphorus-containing albumins, casein, vitellins and 

 the nucleo albumins of the cell protoplasms. 



7. Protamines. (These occur in the spermatozoa of 

 fishes, etc.) 



8. Histones. (These do not occur in the free state but in 

 combination with other complexes, to form substances such 

 as haemoglobin.) 



Group II 



Disintegration Products of Group I : 



1. Acid albumins, alkali albumins. 



2. Albumoses, peptones and peptides. 



3. Halogen compounds of albumins, etc. 



Group III 



Proteids. These are compounds of albumins with other 

 complex groups which have been termed prosthetic groups : 



1. Nucleo proteids, compounds of albumin with nucleic 

 acid. 



2. Haemoglobin and allied substances. (Haemoglobin is 



