

MOUNTING APPENDAGES OP TN8, 



Mounting Dry the Eggs of Insects A> Dim mock, i 



and other objects maj be mounted in sucb :i w 

 amined w ith the m I ■ inted in 



cork between two tl 



Blides. Thus m w iiii black la< 



the specimens < an be pinned in tbe collection witb 



■i Ik- mounted in Canada balsam in these cork 

 rings in the way described by Cameron,* who, bow 

 in place of cork; the latter, however, is lighter than paper, is more 

 convenient for pinning, and can be easily cut im<> rings of different 

 sizes with a cork-borer such as is used in chemical laboratories. If 

 circular cover-glasses are used, the cells can be neatly scaled on a 

 turn-table for preparing microscope-slides. (Psyche, iv. i: 



Preparing Fire flies, etc. — To investigate the seal of oxidation 

 which produces the lighl in Luciola italica, Dr. C. Emery killcii the 

 living animal in a solution of osmic acid, w hicb stains the luminous 

 plates of the still living and light-developing animals brown. The 

 parts which are to be further examined are macerated for a long 

 time in water, the development of fungi in which is prevented by 

 the addition < ils of thymol. Thi acid is especially re- 



duced at the bifurcations of 1 1 • • - blind tracheal capill 



within the luminous plate-, and iii the tracheal branches before the 

 bifurcation. Another method i rvation consists iu injecting 



corrosive sublimate solution into the animal, and - 

 menl with alcohol. (Zeits. fur wissen. Zoologii . ab- 



Btracl in Journ. Roj . Micr. Soc, i vs ">. ?88. 



Mounting the Appendages of Insects for Pinning in the Cabinet 

 A writer in the Bulletin of the Brooklyn Entomological Socii I 

 2 1 Baj s: " The habit of many has be« a after examining the pai 

 an msec! and making dissections to throw away the insect aftei 

 making notes. Others mount them in balsam on glass slides: this 

 latter had been mj practice, but Blides accumulate and are incon- 

 venient to keep. A substitute a knowledge of which 1 owe V 



answer- admirably for all purposes and is perfectly simple. 

 A hole, round or square, is punched or cut oul ol a pit 

 board of any desired Bize; a cover-glass (] use il 

 on cue - the aperture by a thin circh > forms a 



shallow cell in which the part to be examined i- ; i drop of 



Canada balsam') is put on it, and the w huh iso ■ 



, 



*Proc. Nat Hist. 8oc Glasgow, 188 82 



f The balsam will be clouded by the moist ontained in the 



appendages unless it has been macerated in alcohol and oi 



turpentine, or has undergone a long maceration in oil of turpentine. 



