374 SYSTEM or INSECTS. 
Who again, that observes that in proportion as pe- 
date animals approach to the human type, their motions 
are accomplished by fewer organs, — that man walks ore 
subliini upon two legs ; the majority of quadrupeds upon 
four ; insects upon six ,• the Arachnida apparently upon 
eight ; most Crustacea upon ten ,• and the Myriapods and 
others upon many, — but will thence conclude that insects 
must precede the Arachnida and Crustacea P 
Who, once more, that reflects that if any of the supe- 
rior animals are deprived of a limb it can never be re- 
produced, and that in insects the same circumstance oc- 
curs ; while spiders and Crustacea if they lose a leg have 
the power of reproducing it, and the Mollusca if they are 
decapitated can gain a new head, — will consent to their 
being placed after any of these animals a ? 
Lastly, who that recollects that the Mollusca are her- 
maphrodites, like most plants, bearing both male and 
female organs in the same body, — but will allow that in- 
sects, in which the sexes are separate as in the Verte- 
brates, must be more perfect, and of a higher grade b ? 
ii. We now come to the Classes into which the Annulosa 
are divided. This term appears first to have been em- 
ployed by Tournefort, and was adopted by Linne c . As 
the nervous system of animals furnishes the most promi- 
ment distinction of a subkingdom, so the circidation of 
their fluids, and their respiration necessarily connected 
with it, seems best to point out the classes into which it 
may next be resolved. But having fully explained my 
a In this respect insects excel many reptiles, which can reproduce 
some of their parts. 
•> See MacLeay Hor. Entomolog. 203. 20G-. 298—. 
r Linn. PMloe, Botan. n, 155, 1G0. 
