554 BELANGER, ROBICIION, MIGICOVSKY, COPP, VINCENT 



graphs of demineralized sections. These areas appeared consequently 

 to be sites of resorption ( osteolysis ) . 



Osteolysis was enhanced by pregnancy, also by administration of 

 Para-Thor-Mone, norethandrolone, and vitamin D. It was strongly 

 stimulated bv EDTA venochsis. Exaggerated osteolysis was ob- 

 served in osteolathyrism and fluorosis of rat; also in parathyroid 

 adenoma, osteogenesis imperfecta, bone neoplasms, and Paget's dis- 

 ease of man. 



Acknowledgments. Financial assistance has been provided by the Med- 

 ical Research Council of Canada, by the Canada Department of Agricul- 

 ture, and bv the United States Atomic Energy Commission, Division of 

 Biology and Medicine ( Contract No. AT ( 30-1 ) -2779 ) . 



The authors are indebted to Mrs. L. F. Belanger and Mrs. Andree 

 Boucher for technical assistance. Para-Thor-Mone has been graciously 

 provided by the Research Division of Eli Lilly and Company, Indianapo- 

 lis, Indiana. 



Contribution No. 127 from the Animal Research Institute, Research 

 Branch, Canada Department of Agriculture, Ottawa, Canada. 



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