IV CONTENTS. 



No. 5. NOVEMBER, 1920 



FOOT, KATHARINE. Notes on Pediculus Vestimenti 262 



JUST, E. E. The Fertilization-Reaction in Echinarachnius 



Parma, IV 280 



No. 6. DECEMBER, 1920 



HEILBRUNN, L. V. The Physical Effect of Anesthetics Upon 



Living Protoplasm 307 



BOWEN, ROBERT H. Studies on Insect Spermatogenesis, I . . 316 



