Contents of Volume XLII. 



No. i. JANUARY, 1922 



GOWEN, JOHN W. Identical Tzvins in Cattle I 



BILLS, CHARLES E. Inhibition of Locomotion in Paramecium 

 and Observations on Certain Structures and Internal 



Activities 7 



JACOBS, M. H. The Effects of Carbon Dioxide on the Con- 

 sistency of Protoplasm 14 



' HALL, F. G. The Vital Limit of E.vsiccation of Certain Ani- 

 mals 3 1 



No. 2. FEBRUARY, 1922 



BOWEN, ROBERT H. Studies on Insect Spermat agenesis, III . 53 

 VAN CLEAVE, H. J. A Determination of the Degree of Con- 

 stancy in the Nuclei of Certain Organs in Hydatina senta. 85 

 VAN DER HEYDE, HAN C. Hemoglobin in Thyone briarcus 



Lcsuciir 95 



No. 3. MARCH, 1922 



ALLEE, W. C. The Invertebrate Course in the Marine Bio- 

 logical Laboratory 99 



COPELAND, MANTON. Ciliary and Muscular Locomotion in 



the Gastropod Genus Polinices 132 



UHLENHUTH, E. The Effect of Iodine and lodothyrin on the 



Larvce of Salamanders, III 143 



No. 4. APRIL, 1922 



TURNER, C. H. A Week zvith a Mining Eumcnid: An Eco- 

 logico Behavior Study of the Nesting Habits of Odynerus 

 dorsalis Fab 153 



DONISTHORPE, HORACE. The Colony Founding of Acantho- 



myops (Dendrolasius} fuliginosus Latr 173 



WHEELER, W. M. Observations on Gii/antiops destructor 



Fabric-ins and Other Leaping Ants 185 



iii 



I H I 



