CONTENTS 



I. Monograph of the Bombtcine Moths of America North of Mexico, 



INCLUDING their TRANSFORMATIONS AND ORIGIN OF THE IjARVAL MARK- 

 INGS AND Armature, by Prof. Alplieus S. Packard 5-390 



II. On liEACTION-TlMES AND THE VELOCITY OF THE NERVOUS IMPULSE, by Prof. 



J. McKeen Cattell and Dr. Charles S. Dolley 301-415 



III. The Bacteria of River Waters, by l)r. Johu S. Billiugs 417-484 



