194 THE MICROSCOPIST. , 



consisting of nucleated cells, giving off smooth anasto- 

 mosing trabeculae, as in the early stage of the vitreous 

 humor of the eye and of the gelatinous tissue of the um- 

 bilical cord, etc. 



2. Very delicate reticular tissue found in the eye and in 

 the interior of nerve-centres. 



3. A network filled with lymphoid cells (adenoid or 

 cytogenous tissue) in the glands of the lymphatic system, 

 and around the fasciculi of fibrillar connective tissue. 



4. A coarser network in the ligamentum pectinatum 

 of the human eye. 



5. A tissue formed of fusiform and stellate cells, as in 

 the interior of the kidneys 



The second form referred to, or the fibrillar connective 

 tissue, was the only form to which the term connective 

 tissue was formerly applied. It is composed of gelatin- 

 yielding fibrillae, which may be split into skein-like por- 

 tions of various breadth. (Plate XIX, Fig. 146.) Per- 

 manganate of potash stains it brown. Acetic and dilute 

 mineral acids cause the tissue to swell so that the appear- 

 ance of fibrillation is lost through compression, and the 

 cells, or nuclei, are made manifest. Chloride of gold 

 staining exhibits both fibrillae and cells. 



Mastic fibres (yellow elastic) (Plate XIX, Fig. 147) are 

 apparent in all forms of connective tissue which have been 

 made transparent by boiling, or acetic acid. They are 

 non-gelatinizing, cylindric, slightly branched, or forming 

 plexuses. In some fasciculi of fibrillar connective tissue, as 

 seen after the action of acetic acid, elastic fibres appear in, 

 hoops, or spirals, around them. In the ligamentum nu- 

 clese of the giraffe the elastic fibres are marked by trans- 

 verse striae, or cracks. Elastic fibres often form flattened 

 trabeculae, or are fused into elastic plates, or membranes, 

 with foraminae. as in arterial tunics. 



The ligaments of the skeleton, the periosteum, peri- 

 chondrium, aponeuroses, fasciae, tendons, and generally all 



