CONTENTS 
H. H. Donaldson. On the regular seasonal changes in the relative weight of the central nervous 
system of the leopard frog. 50 (575). 
S. Hatai. An interpretation of growth curves from a dynamical standpoint. 51 (576). 
Helen I. King. Experiments to modify the sex ratio in the toad. 52 (577). 
R. S. Lillie. Evidence that the primary change on stimulation is an increase in the permeability of 
the limiting membrane. 53 (578). 
E. B.Meigs. Nature of the muscular contraction. 54 (579). 
Isaac Ott and John C. Scott. A note on the action of internal secretions upon erectile tissue. « 
(580). 
A. B. Eisenbrey and R. M. Pearce. The depressor action of dog's pancreas and pancreatic 
juice. 56 (581). 
G. Carl Huber. The significance of the structure of the medullary loop of the renal tubule. 57 (582). 
S.J. Meltzer. On fundamental changes in the action of some alkaloids upon frogs after cardiectomy 
or ligation of one aorta, b. The changes in the action of curare. 58 (583 1 • 
D. R. Joseph and S. J. Meltzer. On the convulsant action of acid fuchsin (Abel and Barbour) in 
cardiectomized frogs. 59 (584). ' 
I. S. Kleiner and S. J. Meltzer. On the presence of dextrose in the exudate of pulmonary edema- 
60 (585). 
L. L. Woodruff. The effect of culture medium contaminated with the excretion products of Para- 
mecium on its rate of production. 61 (686). 
A. I. Ringer. On the origin of glycocoll in the animal body. 62 (587). 
J. B. Sidbury and William J. Gies. On the diffusion of alkaloids through rubber. 63 (588). 
F. G. Goodridge and William J. Gies. Notes on Fischer's theory of the influence of acids in the 
production of oedema. 64 (589). 
H. J. Karsner and A. B. Nutt. The relation of the toxic dose of horse serum to the protective dose 
of atropine. 65 (590). 
Edna Steinhardt and Thomas Flournoy. The effect of specific vaccines in the typhoid of rats and 
mice. 66 (591) 
J. J. R. Macleod, C. B. Christie and R. G. Pearce. The relationship of the left suprarenal cap- 
sule to the sugar production of the liver in dogs. 67 (592). 
A. W. Hewlett and J. G. Van Zwaluwenburg. Comparison between the blood flow in the arm 
and the hand. 68 (593). 
F. M Hanes and R. A. Lambert. On the phagocytic inclusion of carmine particles by sarcoma 
cells growing in vitro with consequent staining ot the cell granules. 69 (594). 
I. Levin and M. J. Sittenfield. The formation of metastases upon an intravascular injection of 
tumor emulsions. 70 (595). 
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