Contents of Volume LXIII 



No. i. JULY, 1922. 



NEWMAN, H. H. Normal Versus Subnormal Development 

 in Patiria miniata. A Caution to Laboratory Embry- 

 ologists i 



BREITENBECHER, J. K. Somatic Mutations and Elytral Mo- 

 saics of Bruchus 10 



* * 



PLATH, O. E. Notes on Psithyrus, with Records of Two 



Nezv American Hosts 23 



HUMPHREY, R. R. The Multiple Testis in Urodeles 45 



GLASER, OTTO. The Hydrolysis of Higher Fats in Egg- 

 secretion 68 



No. 2. AUGUST, 1922. 



SPRINGER, MARY G. The Effect upon Developing Eggs of 



Extracts of Embryos of the Same Species 75 



DANCHAKOFF, VERA, AND SEIDLEIN, S. M. Digestive Activ- 

 ity of Mesenchyme and its Derivatives 97 



SUMNER, FRANCIS B., MCDANIEL, MARY E., AND HUESTIS, 

 RALPH R. A Study of Influence ^vhich may Affect the 

 Sex-Ratio of the Deer Mouse 123 



No. 3. SEPTEMBER, 1922. 



JONES, D. F. Selective Fertilization and the Rate of Pollen- 

 tube Growth r6tr 



GLASER, OTTO. The Temporary Concentration of Sea-salts 



About Arbacia Eggs 175 



BOWEN, ROBERT H. Notes on the Occurrence of Abnormal 



Mitoses in Spermat agenesis 184 



MAST, S. O., AND COVER, MARY. Relation Between Intensity 

 of Light and Rate of Locomotion in Phacus pleuronectes 

 and Euglena gracilis and its Bearing on Orientation 203 



HUXLEY, J. S. De 'differentiation in Echinus Larvce, and its 



Relation to Metamorphosis 210 



iii 



