PLATE VIII.. 



STRUCTURE AND GROWTH OP BONE BIOPLASM OP MUSCULAR AND 

 ELASTIC TISSUE AND ITS MOVEMENTS. 



Tier. 1. 



Thin section of recently formed bone with periosteum (a, 6. c) . femur of a kitten one day old. 

 Showing changes taking place during tbe development of permanent bone, tbe formation of lacunae, 

 and tbe process of calcification. Vessels of tbe periosteum, blue. a. Outer part of periosteum 

 b, More condensed tissue -with capillaries, c, Layer containing bone-forming biopla&ta. d, Recent, 

 bone, e, Fully developed bone, lacunae still very large, x 210. p. 22i. 



Fig. 4. 



U'ig. 3. 



Growing muscular fibres at the summit of a 



papilla of the tongue of the Hyla. a. Bioplast 



foiming muscular tissue. 6. Nerve bioplast. 



c, Nerve, x 1600, 



Bioplasm and 

 elastic tissue, 



teiial. Tbe 

 bioplasm is 

 moving in the 

 directionof the 

 arrow, and 

 forming the 

 elastic tissue 

 as itproceeds. 



Bioplasm and formed 

 material (contractile 

 Ussue) of muscle. 

 The bioplasm is mov- 

 ing in the directiou 

 indicated by the 

 arrow. It is now 

 between a and b, but 

 waa between 6 and c. 



[To face pae 2CQ. 



