DELAY IN PUBLICATION. 205 



more than fifty extinct genera, beside reestab- 

 lishing three families no longer represented. 



Cotta has written me in very polite terms 

 that he could not undertake anything new at 

 present ; he would rather pay, without regard 

 to profit, for what has been done thus far, and 

 lets me have fifteen hundred francs. This 

 makes it possible for me to leave Dinkel in 

 Paris to complete the drawings. Although it 

 often seems to me hard, I must reconcile my- 

 self to the thought of leaving investigations 

 which are actually completed, locked up in my 

 desk. 



