CONTENTS 
Pa* 
Zoology. — The 'Homing Habits' of the Polmonate Mollusk Onchidium . . . 
By Leslie B. Arey and W. J. Crozier 319 
Zoology. — Growth and Duration of Life of Chiton Tuberculatus .... 
By W. J. Crozier 322 
Zoology. — Growth of Chiton Tuberculatus in Different Environments . . 
By W. J. Crozier 325 
Physics. — The Interferometry of Vibrating Systems . . . . By C. Barus 328 
Physics. — On the Essence of Physical Relativity • • By Sir Joseph Larmor 334 
Physics. — Gravitational Attraction in Connection with the Rectangular In- 
terferometer By Carl Barus 338 
Physics. — The General Character of Specific Heats at High Temperatures . 
By Walter P. White 343 
Mathematics. — On Certain Projective Generalizations of Metric Theorems, 
and the Curves of Darboux and Segre .... By Gabriel M. Green 346 
Physics. — The Rectangular Interferometer 'with Achromatic Displacement 
Fringes in Connection with the Horizontal Pendulum . By Carl Barus 349 
