I. THE TIDAL PROBLEM. 



The Former Bates of the Earth's Eotation and theib 

 Bearings on its Deformation. By T, C. Chamberlin. 



The Eotation-Period of a Heterogeneous Spheroid. 



By C. S. Slighter. 



On the Loss of Energy by Friction of the Tides. 



By \V. D. MaoMillan. 



On Certain Eelations among the Possible Changes in 

 THE Motions of Mutually Attracting Spheres when 

 Disturbed by Tidal Interactions. By F. E. Moulton. 



Notes on the Possibility of Fission of a Contracting 

 EoTATiNG Fluid Mass. By F. E. Moulton. 



The Bearing of Molecular Activity on Spontaneous 

 Fission in Gaseous Spheroids. By T. C. Chamberlin. 



n. GEOPHYSICAL THEORY MDm THE PLAXETESIMAL HYPOTHESIS. 



By Arthur C. Lunn. 



ni, RELATIONS OF EQUILIBRIUM BETWEEN THE CARBON DIOXIDE OF THE ATMOS- 

 PHERE AND THE CALCIUM SULPHATE, CALCIUM CARBONATE, AND CALCIUM 

 BICARBONATE OF WATER SOLUTIONS IN CONTACT WITH IT. 



By Julius Stieglitz. 



