1896.] NATURAL SCIENCES OF PHILABELPHIA. 239 



was much influenced by the teachings of the Stoics. " I would 

 strongly advise you," said he to a friend, " to get hold of the 

 thoughts of Marcus Aurelius, when you are most provoked or vexed 

 in spirit, and take their lessons to heart. Epictetus will do equally 

 well, only I think Marcus is calculated to humble and content a 

 man." His letters contain many expressions of trust in an infinite 

 beneficence, and he would have agreed with Epictetus as to " whither 

 dost thou tend after death, that is to nothing dreadful, but to a 

 place from whence thou camest, to things friendly and akin to thee." 

 We admire Ryder not so much for what he accomplished as for 

 the indomitable spirit that actuated hinl. With imperfect equip- 

 ment, with engrossing occupation, and — for much of his intellectual 

 life at least — with impaired health, he attempted the solution of the 

 most difficult problems. It is not for us to consider in what degree 

 he succeeded. Had Bacon, Franklin or Darwin died at forty-three, 

 or had their days been absorbed as his had been, in cares and the 

 routine of task work, how much less would have been their achiev- 

 raents ! It is enough for us to know that we are studying in Ryder's 

 life phenomena of a mind of the first order, and that we have lost 

 by his death one of the brightest of the group of workers to which 

 he belonged. 



THE PUBLISHED SCIENTIFIC PAPERS OF JOHN A. RYDER. 



BY H. F. MOORE, PH. D. 



This bibliography was originally prepared for the Proceedings of 

 the Ryder Memorial Meeting but the committee having that publi- 

 cation in charge pointed out that the importance of Dr. Ryder's 

 work demanded for it greater publicity than that medium would 

 afford. It was suggested that it would be most fitting to publish it 

 with the preceding memoir. 



The list of papers given is supposed to be complete, being pre- 

 pared partly from memoranda left by Dr. Ryder and partly by 

 research in the bibliographies of the Zoological Record and of the 

 several journals as well as in the sources of original publication. 



The citations, with one or two exceptions, have been verified, and 

 the appended notes are partly from the Zoological Record, partly 

 Dr. Ryder's and partly by the compiler. The list is given under 

 three heads : Original Research, comprising 215 titles ; Descriptions 

 of New Scientific Apparatus, 4 titles; and Translations and Re- 

 views, 59 titles ; a grand total of 278 papers published between 

 1877 and 1895. 



