CONTENTS. XXlll 



PAGE 



XVI. — Additional Note on the Motion of a Heavy Body along the 

 Circumference of a Circle. By Edward Sang, Esq., 

 F.R.S.E., . . . . . . .449 



XVII. — On the Homological Relations of the Cwlenterata. By Pro- 

 fessor Allman, ...... 459 



XVIII. On the Gravid Uterus and on the Arrangement of the Foetal 

 Membranes in the Cetacea. By Professor Turner. 

 (Plates XVII. and XVIII.), . . . .467 



XIX. — On some Abnormal Cones of Pinus Pinaster. By Alexander 

 Dickson, M.D., Regius Professor of Botany in the 

 University of Glasgow. (Plates XIX. to XXII.), . 505 



PART III. (1870-71.) 



XX. — Account of the New Table of Logarithms to 200000. By 



Edward Sang, Esq., F.R.S.E., .... 521 



XXI. — An Experimental Research on the Antagonism between the 

 Actions of Physostigma and Atropia. By Thomas R. 

 Fraser, M.D., Lecturer on Materia Medica and 

 Therapeutics at Surgeon's Hall, Edinburgh. (Plates 

 XXIII.-XXV.), 592 



PART IV. (1871- 2) 



XXII. — On the Decomposition of Forces externally applied to an Elastic 

 Solid. By W. J. Macquorn Rankine, C.E., LL.D., 

 F.R.SS. L. & E., 715 



XXIII. — On the Geometrical Mean Distance of Two Figures on a Plane. 



By Professor J. Clerk Maxwell, F.R.S., . . 729 



