INSTINCT AND FINAL TENDENCY. 



PLATE No. I. 



OO 

 i<j 



Fig. 1. The Scientifically Constructed Nest 

 of the Rhynchites Betulae. (After Wasmann.) 



Fi?. 2. (After Wasmann modified.) Fig. 3. (After Wasmann.) 



The curve g w' u' e' q' o' in' k' h' Vepr^ents the mathemalical hivdute belonging 10 

 the evolute g i 1 n p r t v y. 



