TUMORS. 



501 



tumors in which within myeloma-tissue new formation of bone 

 has taken place. The error resulting from such a nomenclature 

 is not great, as in many instances it is impossible to decide 

 whether the bone-tissue in the tumor is a remnant of the former 

 physiological bone, or whether it is newly formed. A great 

 irregularity in the size and the arrangement of the bone-cor- 

 puscles will favor the view of the bone being newly formed, 



FlG. 201. OSTEO-MYXO-MYELOMA, FROM THE HlP-BONE 

 OF A GIRL. 



T, trabeculse of newly formed bone, with large and irregular bone-corpuscles ; M , myx- 

 oniatous tissue, changing to myeloma ; C, plastids, infiltrated with lime-salts. Magnified 400 

 diameters. 



and this view is strengthened if we are able to trace the new for- 

 mation of bone through all its stages, from the first infiltration 

 of plastids with lime-salts up to the appearance of trabeculae. 

 Besides, it is granted that the myeloma tissue (myxo- or fibro- 



