MODI OF DISSECTING INSEi 291 



each Bide of the back with tin* the dorsal por- 



tion of t! rument can be carefully removed to 



leave the inner cellular layer (hypodermis) untouched; tl 

 onld then be raised, disclosing the ibular dorsal 



heart. I; .. w it lies the alimentary ••anal, which 

 passes through the middle of the body. The nervou 

 tnn cui In- seen upon remo^ inu r the alimentary canal, as it 

 lies loosely on the floor of the body; but in order to wrk 

 nut the ganglia in the head, it is better at first, with a 

 Bharp, thin scalpel, t<> eat a well-hardened locust in two 

 longitudinally, the section passing through the brain ami 

 Buboesophageal ganglion. Indeed, a " sagittal " or longitu- 

 dinal <eeti<>n of a well-hardened locust or grasshopper can 

 he easily made, and when floated out in a shallow pan of 

 water and examined with a Coddington lens attached to the 

 movable arm of the lens-holder can !»■ studied and then 

 put away in a wide-mouthed bottle for future observa 

 Mr. Frank Cheshire has in hi- work on the lion 

 ,.ii some qs< Eul hints on the dissection of that ii In 



order to dissect the Balivary glands of a worker-bee, he 

 adopted the following method: 



•• l'.\ inserting a needle into the mouth of a wi 

 Ing ii upwards, behind the front wall of the head, the lati 



opened thai its salivary (?) glands, in a partly broken couditii 

 ma) be obtained for examination; but if the attachmi 

 forms are to be investigated, we must pro< eed as follow-: Partly till 



hallow reeeptacle, such as a pomatum pot, or 

 with melted bee's or parafhue wax. When cold, with a hot wire melt 

 a little bath in the centre of the waxen surface, and then inscrl the 



. we wish to diss placing in this case tb the 



head is submergi d. l'.\ a s< cond application of tin melt the 



wax in the neighborhood of the head, using no more heat thai 



sarj to secure thorough adhesion, and now i 

 glycerine. A powerful light aud a good w 



cured round the operator's head with a tape, v 

 upon to the forehead if not required) will pen 



dissection, although, of course, heller results sing 



a Stephenson's erecting binocular microscopi i iment with 



which all the dissections for this work hav< Th< 



thus securely held by the wax, both hands manipula 



. with a needle-knife (made bj heating 

 Qat, and afterward- sharpening upon a hone, and inserting i: 



leu handle cut carefully round the compoun . ind lift it 



