PLATE 4 



EXPLANATION OF FIGURES 



The reduced magnification of the figures of this plate is now 630 diameters. 



20 A degenerating osteoclast within a blood capillary (compare fig. 7). 



21 A large osteoclast measuring 40 ju xSOju- It is at the rear of the local region 

 of bone dissolution and somewhat later might have become isolated like figs. 19 

 or 22. 



22 Several huge giant-cells lie stranded in the marrow tissue in an area where 

 bone destruction is locally finished; possibly serial sections would have shown 

 these elements to interconnect. Similar nests occur in the near vicinity. The 

 osteoclast at the left, ocl.', measures 65 /j. x 105 n and contains about 125 nuclei. 



344 



