606 BOOK EBCOEDS. 



in a work of botanical authority, cannot well be wholly ignored 

 in succeeding works of like kind, although it may be questioned 

 there. In topographical botany, where the alleged facts accu- 

 mulate upon us by tens of thousands, no cautious vigilance 

 or even sceptical scrutiny will suffice for entirely weeding out 

 the false ; but a too easy acceptance may greatly increase the 

 mischief. 



