94 DR. BEALE^ ON THE TISSUES. 



rapid increase, and to interfere Avitli tlic production of 

 formed material. For some time before perfect pus-corpuscles 

 were produced^ a tendency to the production of elementary 

 parts, like those of the original texture, was manifested. 



10. The cell-wall is not a constant structure. The defi- 

 nitions generally givcA of the cell are not applicable to the 

 elementary parts of many tissues. Pabulum does not pass 

 through the cell- wall to become altered by the action of the 

 cell, but certain of its constituents are converted into ger- 

 minal matter — the living substance which becomes tissue or 

 is changed into substances which form the constituents of 

 secretions. 



11. In the nutrition of an elementary part the following 

 phenomena probably occur. 1. Inanimate pabulum passes 

 through the formed material into the central portion of the 

 spherical masses of germinal matter, while, 2. Particles pre- 

 viously animated move outwards. 3. The outermost particles 

 of the germinal matter become converted into formed material. 

 4. A corresponding quantity of the old formed material is 

 disintegrated, or the new formed material is added to that 

 previously existing, in which case this structure increases in 

 quantity. In nutrition, without gro^rth, an amount of inani- 

 mate matter becomes living germinal matter Vvithin a given 

 time, exactly corresponding to the proportion of germinal 

 matter which undergoes conversion into formed material, and 

 this makes up exactly for the quantity of old formed material, 

 which being no longer fit for work, is disintegrated, converted 

 into soluble substances, and removed. 



Connective Tissues. 



12. The connective tissues as a class cannot, by any struc- 

 tural characters, be separated from other tissues of the body. 



13. The chief differences between a structure like epithe- 

 lium (cell tissue) and cartilage or tendon (connective tissue) 

 are these. In the first, the formed material of each elemen- 

 tary part is more or less separated from that of its neigh- 

 bours, while in the latter the formed material is continuous 

 throughout, but in both cases, the oldest portion of the formed 

 material is that v/hich is farthest from, and the youngest, that 

 Avhicli is nearest to each mass of germinal matter. 



14. "White fibrous tissue and cartilage do not consist of 

 cells, and an interceUalar substance which is produced inde- 

 pendent of cells; but the so-called intercellular substance 

 exactly corresponds to the cell-wall of an epithelial^^cell, and 



