1. Secular trends in the incidence of hip fractures

   • J. Joseph Melton III
   • W. Michael O'Fallon
   • B. Lawrence Riggs

   Clinical Investigations Pages: 57 - 64

2. The effects of walking on the cross-sectional dimensions of the radius in postmenopausal women

   • Rivka Black Sandler
   • Jane A. Cauley
   • Andrea M. Kriska

   Clinical Investigations Pages: 65 - 69

3. Calcium, vitamin D-endocrine system, and parathyroid hormone in black and white males

   • J. R. M'Buyamba-Kabangu
   • R. Fagard
   • A. Amery

   Clinical Investigations Pages: 70 - 74

4. Vertebral collapse in juvenile chronic arthritis: Its relationship with glucocorticoid therapy

   • S. Varonos
   • B. M. Ansell
   • J. Reeve

   Clinical Investigations Pages: 75 - 78

5. Glycosaminoglycan stimulation of calcium release from mouse calvariae. Specificity for hyaluronic acid and dermatan sulfate

   • David L. Cochran

   Laboratory Investigations Pages: 79 - 85

6. The enamel fluid in the early secretory stage of porcine amelogenesis: Chemical composition and saturation with respect to enamel mineral

   • Takaaki Aoba
   • Edgard C. Moreno

   Laboratory Investigations Pages: 86 - 94

7. Effects of increased doses of 1,25 dihydroxyvitamin D₃ on matrix and DNA synthesis in condylar cartilage of suckling mice

   • Michael Silbermann
   • Klaus von der Mark
   • Dina Lewinson

   Laboratory Investigations Pages: 95 - 104

8. The effect of intravenous sodium fluoride and synthetic salmon calcitonin on plasma total calcium, inorganic phosphate, and ionic fluoride

   • P. A. Monsour
   • J. R. Smid
   • B. J. Kruger

   Laboratory Investigations Pages: 105 - 111

9. Demonstration of 1,25(OH)₂ vitamin D₃ receptors and actions in vascular smooth muscle cellsIn vitro

   • J. Merke
   • W. Hofmann
   • E. Ritz

   Rapid Communication Pages: 112 - 114

10. Announcements

    • Peter V. Hauschka
    • Kenneth G. Mann
    • John D. Termine

    Announcement Pages: 115 - 116