CONTENTS 
Page 
Mathematics. — On the General Theory of Curved Surfaces and Rectilinear 
Congruences By Gabriel M. Green 587 
Petrology. — A Contribution to the Petrography of Southern Celebes . . 
By J. P. Iddings and E. W. Parley 592 
Physiology. — On the Non-Existence of Nervous Shell-Shock in Fishes and 
Marine Invertebrates By Alfred Goldshorough Mayer 597 
Physiology. — Chemical Differentiation of the Central Nervous System in 
Im^ERTEBRATES . . . . . , By A. R. Moore 598 
Physiology. — Proof of the Muscle Tfj^sion Theory of Heliotropism .... 
By Waller E. Carrey 602 
2k)0L0GY. — Changeable Coloration in Brachyur-\ . . . . By W. H. Longley 609 
Oceanography. — The Equilibrium of Tortugas Sea Water with Calcite and 
Aragonite By J. F. McClendon 612 
Genetics. — An Oenothera-Like Case in Drosophila . By Hermann J. Muller 619 
Physiology. — Is Death from High Temperature Due to the Accumulation of 
Acm in the Tissues? By Alfred Goldshorough Mayer 626 
National Research Council. Meetings of the Executive Committee . . . 628 
