On the Classification of Nemertes and Planaria. 43 — 
further an apparent anomaly of this kind in the beings placed at 
the boundaries of two divisions where the material form, to use _ 
the words of Milne Edwards, escapes the supremacy of the nervous _ 
system. ‘The principle however remains always the remote 
cause. 
- ishing law, that wherever the instincts command, the intellect 
1s actionless, and wherever the intellect governs, the instincts are 
silenced or nearly so. There is a struggle and an open struggle ; 
the victory of one of the principles involves the subjection of 
. 
of Vertebrata or the intellectual series, in the order of their zoolog- 
leal gradation: Reptiles, Birds and Mammals :—then Man crown- 
. fat they were, although undergoing a renewal of forms. ‘The 
pri of this is, as Fred. Cuvier states, that the instinct is innate, 
Pia Sightless, necessary and unchangeable, whilst the intellect 
Progressive, conditional and susceptible of modifications. 
an des travaux de F. Cuvier, sur l’instinct et Pintelligence des 
