CONTENTS. 



PAGE. 



Introduction 3 



Material and method 4 



Observations 6 



Discussion 28 



Extraosseous macrophages 29 



Development 31 



Mobilization 33 



Activity 34 



Decline 35 



Intraosseous maerophagcs 36 



Development 36 



Activity 37 



Decline 40 



Comparison of rxtraossrous and iiitrao.ssrous niarrophaurs 41 



Conclusions 43 



Bibliography 44 



Description of figures 45 



2 



