76 STUDENTS HISTOLOGY 



acid. The process is slow, but it leaves the tissue in excellent 

 condition . 



Sections cut in the usual way may be stained with carmine and 

 picric acid, and examined in a drop of glycerin. They should not, 

 after the staining, be placed in the oil of cloves, as they would curl 

 and become hard. Transfer them to equal parts of glycerin and 

 water, from which they are to be carried to the slide. Add a drop 

 more of the dilute glycerin if necessary and put on the cover -glass, 

 carefully avoiding air -bubbles. If you desire to make a perma- 

 nent mounting, the edge of the cover must be cemented to the 

 slide. 



Thoroughly wipe the slide around the cover with moistened 

 paper, until every trace of glycerin is removed. Then with a sable 

 brush, paint a ring of zinc cement (vide formulae) around the 

 slide just touching the edge of the cover -glass. Repeat the 

 cementing in twenty -four hours. A turn-table will be a useful 

 aid in this work. 



SPECIAL CONNECTIVE TISSUES 



Connective Tissue of the Lymphatic System. The matrix of 

 lymphoid or adenoid tissue consists of a network of fibers and 

 cells, which support the lymph -corpuscles. It is distributed exten- 

 sively in organs, and where it appears in stained sections, the 

 lymphoid cells are so numerous as to obscure the reticulum almost 

 entirely. The structure will be minutely described in connection 

 with the lymphatic system. 



Embryonic Connective Tissue presents a homogenous, mucoid 

 matrix containing branched cells. It is not found normally in the 

 adult. The jelly of Wharton of the umbilical cord is mucoid tissue. 

 i 



MUSCULAR TISSUE 



This tissue is found in three varieties: 1. Non-striated, smooth 

 or in voluntary. 2. Striated, skeletal, or voluntary. 3. Cardiac. 



NON- STRIATED MUSCLE 



The histological element of non- striated muscle is a spindle- 

 shaped cell from 45-225 p long and 4-7 p broad. The cell body 

 presents longitudinal striae, and contains an ovoid nucleus. The 

 nucleus contains a reticulum which is probably in connection with 



