LIBBIE H. HYMAX. 



however, ran over such long periods of time in many cases, that 

 the temperature could not be kept constant by personal atten- 

 tion and varied during the night with changes in the air tem- 

 perature. 



4. Results. The results of the oxygen consumption experi- 

 ments are given in Table I. Thirteen experiments were per- 



TABLE I. 



OXYGEN CONSUMPTION OF APICAL AND BASAL HALVES OF THE BODY 

 OF THE SPONGE Grantia. 



Duration of each experiment three hours. Temperature in different experi- 

 ments 21 to 23 C. Oxygen given in cubic centimeters. 



formed, of which one (No. 10) was lost. The table shows the 

 oxygen content of the whole tube (A + B + C + D) at the 



