X Contents. 



May 3, 1880. 



On the included pebbles of the Neocomian deposits of Potton and Up- 

 ware, and their bearing upon the physical features of the lower cre- 

 taceous period. By W. Keeping ...... 377 



On the development of the structure known as the "glomerulus of the 



head-kidney" in the chick. By A. Sedgwick .... 379 



May 17, 1880. 



On Newton's organic description of curves. By C. Taylor . . .381 

 Addition to a previous paper on some theorems in Trigonometry. By 



J. W. L. Glaisher 383 



Addition to Mr Hicks' paper on the problem of two pulsating spheres in 



a fluid (pp. 276— 285) . . . . . . . . .387 



The Council, 1878—1879 230 



„ „ 1879—1880 388 



Index of authors, with titles of papers . . . . . . . 389 



Index of names of persons . . 393 



Index to the Transactions of the Cambridge Philosophical Society, 

 Vols. I— XII. 



Names of authors 399 



Index of subjects .411 



