182 THE SENSES AND SENSE-OBGANS OF INSECTS. 



the so-called compound eye does not give a number of 

 images of the object, but a single stippled image, or imago 

 in mosaic. 



A few words were said, in conclusion, concerning the 

 sensorium and nervous system in insects. The brain of the 



D. 



("'Ti'- mx.. Itij- 



Fio. 2. 



Bbain and Nreve-Chain of Cookkoaoii. 

 (From C. Lloyd Morgan's Animal Biology. Fig. 82.) 



A. B. C. Head of cockroach oponod so as to expose the brain : A. from 

 the front; B. from the side ; 0. from above (after E. T. Newton). 

 D. Nerve-chain, removed from the ventral region of the cockroach. 

 a)i. Antennary nerve ; an. I. antennary lobe ; a. stij. anterior stomato- 

 gastric ganglion ; con. commissure to thoracic ganglia ; f.g. frontal 

 ganglion ; /(. s. hemisphere of brain ; la. labial nerve ; lb. nerve to 

 labrum ; mn. mandibular nerve ; mx. maxillary nerve ; n. w. s. nerve 

 to white spot ; op. optic nerve ; p. stg. posterior stomato-gastrio 

 ganglion ; r.n. recurrent nerve ; «. a:, sub-oesophagoal ganglion. The 

 gullet is darkly shaded. 



cockroach is shown in Fig. 2, from the writer's Animal 

 Biology, by permission of Messrs Rivington. 



Note. — For a short popular account of the senses and sense-organs of 

 insects, the reader is referred to an article on The Honey Bee, in the 

 current (August) number of Murray's Magazine. 



