146 



ZOOLOGICAL PHILOSOPHY 



ARACHNIDS. 

 (Class VI. of the Animal Kingdom.) 



Oviparous animals which have jointed legs throvghout their lives and 

 eyes in their head ; they undergo no metamorphosis and never have mngs 

 or elytra. 



Stigmata and limited tracheae for respiration ; a rudimentary circula- 

 tion ; several fertilisations in the course of their life. 



Observations. 



The arachnids, which come after the insects in the order that 

 we have established, display obvious progress in the perfection of 

 organisation. 



Sexual reproduction, for instance, is foimd among them, and for the 

 first time in its full capacity, since these animals copulate and pro- 

 create several times in the course of their Ufe ; whereas in the 

 insects the sexual organs, like those of plants, can only achieve a 



