CLASSIFICATION OF ANIMALS. 9 



sure that they present fruitful fields of enquiry to every naturalist, 

 and I hope many years will not elapse before I shall be in a position 

 to lay something much more tangible upon this important subject 

 before you. 



I would suggest, in conclusion, the immense advantage of nume- 

 rous workers in this branch of research, and that each of you who 

 are conversant with the different varieties of tissue, should take every 

 opportunity of making such observations as opportunities occur, 

 whilst reports of all such researches, even if they extended only to 

 some single species, and even to a single tissue, would form most 

 valuable notes, and be a great addition to the Journal. Elaborate 

 papers are not necessary, so that each member will bring the note 

 of a single careful observation. 



