APPENDIX. 353 



less interested in denying these facts, and who persisted 

 in the old ideas ; and there may even now be some who 

 adhere to similar views. It follows, from these re- 

 searches, that the statements which I made in reference 

 only to the Phlebenterous Molluscs actually applied to 

 this entire division of the animal kingdom, while that 

 which I had myself regarded as an exception, from too 

 great a faith in the infallibility of our illustrious pre- 

 decessors, was found to be in reality the general law. 



The question of the circulation of the Molluscs being 

 once determined, it only remained to consider those 

 facts and ideas which seem to me to group themselves 

 around the word Phlebenterism. Here, too, I must be 

 permitted to observe that all my general results and 

 deductions have been successively confirmed and 

 adopted. In entering upon this hitherto unexplored 

 path of inquiry, I had doubtless been guilty of many 

 errors and omissions, and in some cases especially, I had 

 attached too much importance to negative results ; but, 

 during my Sicilian expedition, before any controversy 

 had been excited on the subject, I had rectified some 

 errors, and filled up many of those deficiencies, which, I 

 may almost venture to say, are inevitable in a first 

 inquiry. At the present time the word Phlebenterism, 

 in the signification that I have -attributed to it, with all 

 the consequences that I have deduced from the facts 

 which had led me to advance it, has been adopted in 

 Germany and elsewhere even in elementary works. 



Note XVI. 



Johann Miiller, a corresponding member of the 

 Institute, and a professor at the University of Berlin, 

 must be considered as the leader of modern physiology 



VOL. I. A A 



