THE MICROSCOPE IN ANIMAL HISTOLOGY. 183 



structure of formed material in animals, with special 

 reference to the minute anatomy of the human body. 

 Following the generalization of Dr. Beale, page 118, we 

 may classify histological structures as follows : 



A. INORGANIC AND ORGANIC ELEMENTS OR PABULUM. 



Eesultiug in 



B. BIOPLASM ; or, 0. H. C. and N\, with other chemical 



elements, plus. The cause of life. 

 From this results : 



C. FORMED MATERIAL, consisting of, 



I. CHEMICAL PRODUCTS ; Organic Compounds, etc. 



II. MORPHOLOGICAL PRODUCTS. 1. Granules; 2. Globules; 



3. Fibres ; 4. Membrane. 

 Forming Tissues. 1. Simple ; 2. Compound. 

 Arranged in Organs. 1. Vegetative ; 2. Animal. 



I. THE CHEMICAL PRODUCTS of Bioplasm are very nu- 

 merous, and belong to the science of Histo-Chemistry. 

 Our plan allows us to do little more than to enumerate 

 the principal groups. It has already been stated that the 

 true chemical structure of bioplasm, or living sarcode, 

 (protoplasm in a living state) is unknown, since it is only 

 possible to analyze the dead cell substance. Of the rela- 

 tion of the oxygen, hydrogen, carbon, and nitrogen, etc., 

 which constitute its "physical basis," we can only specu- 

 late, or imagine. See Chemistry of Cells and their Products, 

 page l'2'2. 



The chemical transformations of cell-substance into 

 " formed material " consist chiefly, with water and min- 

 eral matter, of certain groups of organic principles, some- 

 times called albuminous or " protein " substances, and 

 their nearer derivatives, as glut in-yielding and elastic 

 matter, with fat and pigments. These materials are sub- 

 ject to constant secondary changes or transformations, 



