iy CONTENTS OF VOLUME XLV. 



No. 5. NOVEMBER, 1923 



SWINGLE, W. W. Iodine and Amphibian Metamorphosis. . 229 

 HYMAN, LIBBIE H. Some Notes on the Fertilization Reaction 



in Echinoderni Eggs 254 



No. 6. DECEMBER, 1923 

 SCHRADER, FRANZ. The Origin of the Mycetocytes in Pseu- 



dococcns 279 



UHLENHUTH, EDUARD. The Endocrine System of Typh- 



lomolge rathbuni 303 



PLATH, O. E. Breeding Experiments with Confined Bremus 



(Bombus) Queens 3 2 5 



