HIGH SCHOOL ZOOLOGV, 



15 



Fijj. 3. — Illustrations of the Simple Tissues of the Catfish 

 1. Egg, as tyi>e of an animal cell. 2. Scale-like epithelial fells from skin. 3. Col- 

 umnar ones from intestines. 4. Neuro-eiiithelial ami sujiporting cells from ear. 5. 

 Ijoose connective tissue fonned of brancheil cells (b) wiih fat (a) ami pigment-cells (c). 

 a. Blood cells ; a, colourless, b and c coloured. 7. Cartilage. 8. Bone 9. Tooth with 

 pulp-cavity, dentine and eiiamel-caj). ID. Simple uiusele-cells. 11. Striated muscle- 

 fibre. 12. Nerve-cells. 13. Nerve fibre. 



