48 



THE PHASES OF 



^--. 



in every particular like the nuclei of the cartilage-corpuscles 

 mentioned before. (See Fig. 14.) 



When the solid substance forms the nucleus of a proto- 

 plasmic body, conical spokes arise from its periphery, which 



blend with the reticulum of the 

 protoplasm. When the solid 

 substance alone fills the cavity, 

 the spokes traverse the light 

 B rim between its periphery and 

 the border of the basis-sub- 

 stance of the cartilage. 



In the cartilage of a pup, 

 six weeks old, cavities are 

 found which contain granular 

 protoplasm, and lumps of a 

 homogeneous, yellowish, shin- 

 OF THE FEMUR OF A PUP, FIVE DAYS ing substance, variously dis- 

 OLD. tributed. (See Fig. 15.) There 



A, solid vacuoled corpuscle ; B, corpuscle with are some cartilage-corpuscles 



one solid nucleus; C, corpuscle with two solid .,, ITT 



nuclei. Magnified 800 diameters. with a central solid mass of the 



shining substance ; other cor- 

 puscles with several solid lumps of different size ; lastly, corpuscles 

 in which the shining substance appears as an incomplete shell, in 

 the optical diameter as a semi-lunar ledge. Cavities filled with the 



FIG. ^.-CARTILAGE-CORPUSCLES FROM 

 A FRONTAL SECTION OF THE CONDYLE 





FIG. 15. CARTILAGE-CORPUSCLES FROM A SAGITTAL SECTION OF THE 

 CONDYLE OF THE FEMUR OF A PUP, Six WEEKS OLD. 



A, corpuscle holding, besides the nucleus, several larger granules ; B, corpuscle with a solid 

 oblong nucleus at the periphery ; C, corpuscle with two solid nuclei ; 2>, solid, vacuoled 

 corpuscle. Magnified 800 diameters. 



shining substance are less frequent than in the cartilage of a newly 

 born animal, and the substance often exhibits larger vacuoles. 



