MOl A TINQ PARTS OF TM ! 315 



expanded, when a dropof turpentine is app i laid on the 



lie, and :i clip applied before the pressun is remo 1 i the 



tongui To secure the whole toi plil one end of a small 



for an inch i d holding the split open bj a knife blade, place 



'lie sev< nil head in the cleft with tin- tup downward, and. withdi 

 ing the knife blade, allow the -tick to < lose upon the head, when it 

 will fully distend the i" dip the bead anil tongue in tur- 



pi minr. and leave it immersed for a few days, when it will lie found 

 well cleaned, still perfectly distended, and can he released from the 

 slick it cut from the head without danger of it- collapsing. Mounted 

 in a c.ll in balsam, it is a truly beautiful object. " (Amer. .Month. 

 Micr. Journ., 1884, 12. 



A. I. Woodward immerses the living fly in alcohol, "and with 

 perfectly satisfactory results. At the moment of death the tongue is 

 forcibly protruded to its entire length. Even the >h<>rt proboscis of 

 the house-fly i- satisfactorily displayed." (Amer. Month. Micr. 

 Journ.. 9 



Mr. II Sharp mounts the lobes of the proboscis of the blow-fly, 

 without pressure, in a solution of biniodide of mercury in om 

 iodide of potassium (both saturated solutions), which brings out the 

 details of the structure of the p ch( i "! ! i :•■■ I pro- 



bosces of Mow Hies mounted in balsam, with and without press 

 bul there is Dothing to be seen of the mi mbranc in any of them; I can 

 ju-t see i: in a glycerine mount, now that I know what to look for; 

 but the glycerine doe- not make it visible like the mercury solution." 

 (Journ. Roy. Micr. Journ., 1884, 1008; 1885, ;:::;. 



Microscopic Sections of the Proboscis of Flies. Bugs, and Bees.- 

 e\e, iient work done by Dim mock on the mouth-parts of the mosquito 

 and other flies, bj Kraepelin on those of the fly, flea, and Ecmiptcra, 

 was chiefly by means of microscopic sections. En order to ascertain 

 whitlnr the pseudotracheee of the fly's label la are hollow or not, 

 Dimmock fed the fly with a mixture of sugar and gum arabic, colored 

 with carmine, then plunging it suddenly into strong alcohol to ti\ the 

 colored solution in ii- mouth-parts. Mr. Cheshin • cutting 



sections of the bees and other honey feeding insei mmends 



that the in-cct to lie operated upon should he \, 



time, and then Ud on honey mixed with gelatine ; ' ited with 



some highly colored dye; the insect should he immedi 



ia ted, and the head rapidly cooled and then embeddi elatini 



the section cut by means of the microtome. The mouth] 

 then easily -■■■ n from the presence of the d\ 



Sections of the Ovipositor or Sting.— According to Mr. .1 \Y Hyatt. 

 the insect or organ is placed in alcohol until it i- tl . '.y perme- 



ated, and then removed to a clear alcoholic solu shellac, iu 



