DR. BEALEj ON THE TrSSUE.S'. 95 



like this, was produced from the masses of germinal matter 

 (cells) , No 'intercellular substance^ is produced independently 

 of the li^dng active granular substance in the ' cell/ or ger- 

 minal matter. 



15. The *■ nuclei ' or masses of germinal matter of teiulon 

 correspond to the ' nuclei ' of an epithelial cell. The fibres of 

 yelloAV elastic tissue in tendon are neither connected with, nor 

 formed from or by, these ' nuclei. The matter of the ' nuclei ' 

 gradually undergoes conversion into the white fibrous tissue, 

 Avhile new nucleus or germinal matter is produced from the 

 pabulum. 



16. The ' mucous tissue ' of the umbilical cord, is a modifi- 

 cation of fibrous tissue. No system of communicating tubes 

 for the circulation of nutrient juices can be demonstrated 

 in it. 



17. In certain tissues (cartilage, epithelium) the masses 

 of germinal matter produced bj^ division are quite separate and 

 distinct from each other, while in others (tissue of umbilical 

 cord, tendon, periosteum, &c.) they remain for some time con- 

 nected together. Thus a thread-like or stellate arrangement 

 may be produced, and as the several masses become further 

 separated, the points of communication are reduced to narrow 

 lines and often disappear altogether. 



18. The osseous tissue is composed of formed material which 

 is afterwards impregnated with calcareous matter, and corre- 

 sponds to the matrix of cartilage and to the wall of an ' epithe- 

 lial cell,' as for instance that of a ' cell ' of cuticle. 



19. The lacuuce of living bone are occupied with germinal 

 matter (nucleus) and formed material, in which calcareous par- 

 ticles are still being deposited from without inwards. 



20. The canaliculi are mere spaces which are left during 

 the accumulation of calcareous matter in the formed material. 

 Through these channels fluids pass to and from the germinal 

 matter in the lacuna?. They are wot processes which grow , but 

 are merely channels v)Mch are left. 



21. No dentinal 'tubes' exist in living dentine. The 

 ' dentinal tube ' like the lacuna, contains germinal matter and 

 formed material, and the latter is gradually impregnated with 

 calcareous matter from without inwards, — that is, the oldest 

 formed material first undergoes the process of calcification. 



22. The so-called gray or gelatinous fibres are real nerve 

 fibres, and there are many ganglia which are connected with 

 these fibres alone. The ultimate ramifications of all nerve 

 fibres closely resemble the gray or gelatinous fibres. These 

 fibres are numerous in the pericardium and are distributed to 

 all the vessels. 



