Bibliography. 259 



number of articles did not issue from his pen. His 

 first paper, on the Ova of Flustra, and another of 

 similar nature were read before the Plinian Society 

 of Edinburgh in 1825. His last note, on the Dis- 

 tribution of Fresh-Water Bivalves, appeared in Na- 

 ture but a few days before his death. 



During the first twenty-five years the articles 

 have mostly a geological and zoological bearing, but 

 later botanical and anthropological subjects come 

 into prominence. They were contributed to many 

 publications, including a few American, German, and 

 French journals. The mass of papers, however, are 

 to be found in the Proceedings and Transactions 

 of the Geological Society of London, the Philo- 

 sophical Transactions, the Philosophical Magazine, 

 the Annals and Magazine of Natural History, and 

 Nature. 



It is in these papers that we first find the germs 

 of many of those more elaborate works to which 

 general attention has been attracted. Thus the 

 works on the " Origin of Species," the " Fertilisa- 

 tion of Plants by Insects," the " Action of Earth- 

 Worms," and others, were foreshadowed at a time 

 considerably antedating their final appearance. 



Darwin seemed to prefer to work out and write 

 out his ideas alone. Once at least, however, he 

 shared the toil with his friend, Mr. Wallace, and 

 later, in several instances, with his sons Francis and 

 George Darwin. 



Regarding the separately published works of Dar- 

 win there is much of interest from the bibliographi- 

 cal point of view. The conscientiousness with which 



