CONTENTS. 



Extract from the Laws of the Society relating to the Transactions, .... 



Officers of the Society for the year 1869, 



List of the members of the Socioty elec!<"i since the publication of the Twelfth volume, 

 List of the members reported deceased since the publication of the Twelfth volume, 



1'AfiE 



ii 



v 



vi 



viii 



PART I. 



ARTICLE I. 

 On California Mosses. By Leo Lesquereux, . 



ARTICLE II. 

 On the Mathematical Probability of Accidental Linguistic Resemblances. By Pliny Barle 



Chase, A.M., 



ARTICLE III. 



On the Comparative Etymology of tho Yoruba Language. By Pliny Earle Chase, A.M., 



ARTICLE IV. 



Thoughts on the Influence of Ether on tho Solar System. By Alexander Wilcocks, M.D. 

 (with a plate), ............... 



25 



35 



73 



ARTICLE V. 

 On New Mosses. By Thomas P. James, 



ARTICLE VI. 

 On the Numerical Relations of Gravity and Magnetism. By Pliny Earle Chase, A.M., 



. 105 



117 



PART II. 



AKTICLE VII. 

 On tho Myriopoda of North America. By II. C. Wood, Jr., M.D. (with throe plates, I, II, III), 137 



