CONTENTS. 563 



LIST OF ILLUSTRATIONS. 



Page. 



Researches in sound, by Joseph Henry : 



Fig. 1. Diagram, Action of the wind in depressing waves of sound 512 



Fig. 2. Diagram, Action of the wind blowing against sound 513 



Fig. 3. Diagram, Disturbing effect of two winds 513 



Fig. 4. Diagram, Block Island 520 



Fig. 5. Curve representing normal limit of audibility 527 



Fig. 6. Diagram, Little Gulf Island and vicinity 529 



Fig. 7. Diagram, Effect of wind on sound 533 



Fig. 8. Diagram, Effect of wind on sound 535 



Fig. 9. Diagram, Effect of wind on sound 537 



Fig. 10. Diagram, Effect of wind on sound 538 



Fig. 11. Diagram, Effect of AVlnd on sound 539 



Fig.. 12i' Diagram, Effect of wind on sounds ... 539 



