SYSTEM OF INSECTS. 363 
in which this system is molecular*. And to this division 
of the kingdom, as founded on a satisfactory basis, I 
should recommend you to adhere: but in popular lan- 
guage we may speak of vertebrate and invertebrate ani- 
mals, as forming the first subdivision of them, taken from 
a character obvious to every one who sees them. 
If you inquire into the rank of each of these subking- 
doms, of course you will assign the principal station to 
the Vertebrates, which are the most perfectly organized, 
to which man belongs, and over which he immediately 
presides. If we form the scale according to the nervous 
system of each province, that in which the organ of 
sensation and intellect is most concentrated will stand 
first; and in proportion as this organ is multiplied and 
dispersed will be the station of the rest, which will place 
them in the order in which I have mentioned them; and 
the Annulosa, to which insects belong, will precede the 
Mollusca, which Cuvier and Lamarck had placed before 
them on account of their system of circulation. But 
when we reflect that a heart and circulation occur in some 
of the conglomerate Polypz?, animals that approach the 
vegetable kingdom; that some of the acephalous Mollusca 
have no visible organs of sense, except that of taste, 
whose substance is little better than a homogeneous gela- 
tinous pulp, and who seem from their inert nature to. 
a Hor. Entomolog. 200—. When my account of three primary 
types of Nervous Systems (sce above, p. 3—.) was written, Mr. Mac-. 
Leay’s system did not occur to my recollection, or I should have no- 
ticed it with due honour. To the other types there mentioned ° 
should be added a fourth, the filamentous, or that of the Radiata ; 
the ganglionic being stated as resolvable into two. 
» Savieny Mem, sur les Anim. sans Vertebr. IL. i. 3. 
