174 



Introduction to Botany. 



is for the purpose that an insect which has alighted on the 

 flower may easily find the right way to the nectar, so the 

 color of the corolla as a whole is for the purpose that 

 the flowers possessed of such a corolla may be recognized 



eiit(l(M Ixfe Gelieimiiii's j 



//// /■ ^ ///////// M ^//' 







,K^ 



^i^)n;c,n:L 



ChRISTIAxKoXRAD Sl'lUiXOEIv i 



Fig. 90. 



Reduced facsimile of the title-page of Sprengel's book, " The Discovered Secret oi 

 Nature in the Structure and Fertilization of Flowers." 



from afar as receptacles of nectar by insects which are fly- 

 ing about in quest of food. 



