ELEMENTARY FORMS. 35 



the blood coagulum. They are developed from the Chyle and Lymph cor- 

 puscles, and are metamorphosed into coloured blood corpuscles, without 

 nuclei. 



2. Blood Plasma, the fluid element of the blood, contains, dis- 

 solved in water : 



a. Fibrin, more in males, in pregnant women, and in inflammations, par- 

 ticularly of the lungs. 



b. Albumen, more in females than in males. 



c. Fat, in indefinite quantity; the greater the quantity, so much the more 

 white the serum. 



d. Extractive matters. 



e. (Peculiar smelling substance, which is especially brought out by sul- 

 phuric acid, and may serve to distinguish between animal and human blood.) 

 (Barmel.) 



f. Salts: 1. Soda and lime, with lactic, fatty, carbonic, sulphuric, and 



phosphatic acids; particularly ch lor. sodium (common salt). 



2. Lactate ammonia. 



3. Phosphor. Lime and Magnesia. 



Oxide of iron is found in the blood in very indefinite quantity, only. Bile, 

 urea,' as well as sugar also, are found probably only in diseased blood. 



Although the composition of the healthy blood differs according to the age, 

 sex, &c. of man, there always remains, nevertheless, a certain relative propor- 

 tion of the elements before quoted. F. Simon gives the following proportions 

 as the result of an analysis of healthy venous blood. 

 1000 parts of blood consist of: 



Water 791-900 



Solid residue .... 208-100 



Fibrin . . . . .2-011 



Fat 1-978 



Albumen ..... 75-590 



Globulin 105-165 



Hsematin 7-181 



Extractive matter and salts . . 14-174 



The arterial blood contains less solid elements, less fat, albumen, haematin, 

 extractive matters, and salts. The blood also of ven. porta., mat of the 

 hepatic veins, &c., present each again particular differences. 

 Coats of vessels, see Angiology. 

 Muscular tissue, see Myology. 

 Tissue of nerves, see Neurology. 



37. Tissue of Glands. 



Glands, glandulse, was the name formerly given to all soft, 

 roundish, highly vascular organs, with or without excretory ducts. 

 They are organs of the most different sizes, which take away 

 certain substances from the blood, for the purpose of conducting 

 them (as such or metamorphosed) either immediately to the sur- 

 face of the body, or first into cavities, where they become mixed 

 with their contents. They are therefore divided into membranous 

 and vascular glands. 



1. Membranous, or glands of mucous membranes, possess a 



