172 



Elementary Zoology. 



the cells into a connecting substance, which may be of a trans- 

 parent structureless appearance, or may be definitely fibrillar. 

 The accompanying figure (Fig. 80) will illustrate one form of 

 connective tissue exemplifying the fibrillar change, while Fig. 

 81 of hyaline cartilage will exemplify the first-mentioned type 



F1G.81.— Arlicular cartilage from head of metatarsal bone of Man Cosmic 

 acid preparation). The cell-bodies entirely fill the spaces in the 

 matrix. 340 diameters. (After Shafer, from Quain's " Anatomy.") 



a, group of two cells ; h, group of four cells ; h, protoplasm of cell, with 

 ^, fatty granules ; ?/, nucleus. 



of modification. These tissues are always skeletal or protec- 

 tive. Thus bone and cartilage are skeletal tissues, while the 

 layers of more delicate connective tissue, which evolve and 

 permeate the different organs, are rather protective in function. 



