( 366 ) 

 TABLE XXXVIII. 





Systematic Survey of the Sequence, according to Age, of the Human 



Tissue-groups. 

 (Phylogenetic Classification of Vertebrate Tissues.) 



FIEST GROUP: PRIMARY TISSUES (Epithelium). 



1. FIEST HISTOLOGICAL STAGE OF EVOLUTION. 



I. Covering-tissue (Epithelium). 

 LA. Skin-covering tissue (Epithelium dermafe). ( \- g^J j* 1 " 



fiMUSAft" Gastrula (after T : S 



I. #. Intestinal covering tissue (Epithel. gastrale). ( 1. Real intestinal epithelium 



Intestinal layer, or Entoderm, of Gastrula { 2. Epithelium of the intestinal glands 

 (afterwards the intestinal-glandular layer) ( 3. (Earliest site of origin of egg-cell ?) 



SECOND GROUP: SECONDARY TISSUES. 

 (All derived from the Covering-tissue, or Epithelium.) 



2. SECOND HISTOLOGICAL STAGE OF EVOLUTION. 

 II. Connective-tissue (Connectivum). 



3. THIRD HISTOLOGICAL STAGE OF EVOLUTION. 

 III. Nerve-muscle Tissue (Neuro-musculum). 



fl Nprvp cells ( * -lPeripheric nerve-cells (Rod-cells of 



01. E. Nerve-tissue (TfeZa *' S!iSfcm-illt i the sense-organs) 



nervea). Original outer (Oanglion-cells) ( i. & . Central nerve-cells (mind-cells) 



portion of the nerve- -( f 2. a. Sheath-less nerve-fibres (pale, or 



muscle cells of the 2. Nerve-fibres 1 medulla-less fibres) 



Exoderm (Nerve-tubes) } 2. 6. Sheathed nerve-fibres (dark fibres, 



( with medulla) 



I II. F. Muscle-tissue (Tela 

 muscularis). Original 

 inner portion of the 

 nerve-muscle cells of 

 the Exoderm 



1. One-celled muscle- jl.a. Smooth contractile fibre-cells 



fibres ( 1. 6. Striped contractile fibre-cells 



2. Many -celled muscle- ( 2. a. Smooth muscle-masses 



fibres ( 2. b. Striped muscle-masses 



4. FOURTH HISTOLOGICAL STAGE OF EVOLUTION. 

 IV. Vascular Tissue (Vasalium). 



'l.a. Exocoelarium (Parietal Coelom-epi- 



I Ovlnrinm I thelium) (and secondary site of 



IV.C VascuTarliningtissnel^Sm-epithe.!, ^^1^^! 

 (Tfeta vasouiS). Inner, 

 wall-covering of the" 



Coslom system . ., o 



. a. Endothelium of the lymph-vessels 



V v "Uum)~ "' 1 2> 6 ' ^d " 161111111 of the blood-vessels 



IV. B. Lymph-tissue (Tda. I 



lymphatica). Liquid J 1. Lymph (Colourless blood-cells and fluid intercellular substance) 

 contents of the Cffilom 1 2. Blood (Bed blood-cells and fluid intercellular substance) 



