CONTENTS 
Page 
Zooi^OGY. — Prbi/IMINary Report on PteiuSROAtes in Pogonomyrmex Calif ornicus 
By H. Shapley 687 
Chemistry. — Hydrogen Ion Concentration of the Contents op the Smali, 
Intestine By J.F. McClendon 690 
PATHOI.OGY. — ^BLOOD CONCENTRATION CHANGES IN INFLUENZA. . . . . . 
By F. P. Underhill and Michael Ringer 692 
Physics. — Luminescence at High Temperatures 
By E. L. Nichols and D. T. Wilbur 693 
Z0OI.OGY. — FUNCTIONAI, REGUIvATIONS IN AnIMALS WITH COMPOSITE SpINAI, 
Cords By S. R. Detwiler 695 
Physics. — Experiments with the Tube Resistance Furnace on the Effect 
OF Potential Difference . . By A. S.King 701 
Mathematics. — ^An Application of the Porism of Four Tangents of a 
Twisted Cubic . ByJ.H. McDonald 702 
Zoology. — Studies on the Transformation of the Intestinal Flora, with 
Special Reference to the Implantation of Bacillus Acidophilus. II. 
Feeding Experiments on Man . . By H. A. Cheplin and L. F. Rettger 704 
Geology. — The Kilauea Volcano Observatory 706 
Index .717 
