10 



ENTOMOLOGICAL NEWS. 



[Jan., '08 



hairy forms. Third, economy of time. Fourth, economy in 

 cost of making the apparatus. We at once proceeded to ex- 

 periment with a view of devising a tank and oven that should 

 meet these four requirement, and from old tin cans produced 

 an oven and tank that, after Mr. Henry Engel has inflated 

 hundreds of larvae, from the monstrous Samais (which we 



a, bottom section of tank 12 x iS in., half filled with water as shown ; ', tube leading- 

 air to blowpipe; a", stopcock to shut air from blowpipe; a'", sockets to hold guide rod ; 

 b, top section of tank n x 18 in. ; b' b', screw-eyes soldered to top of b to slide on guide 

 rod b'" ; b" b", weights to regulate air pressure bv adding or removing; d'", guide rod, 

 % in. round iron, to keep upper tank perpendicular in center of lower tank ; c, outer shell 

 of oven 6 x 6 x 8 in. high ; c\ glass gauge tube, to show amount of water in boiler; c", 

 blowpipe in position for drying larvae ; c'", inner shell of oven 4% x 4^ x 7 in. ; d, spring; 

 clip to hold blowpipe ; d', tube % in., to fill boiler and allow escape of steam or vapor ; 

 d" d", wire support to which clip is soldered ; d'", rubber tube % in. from tank to blow- 

 pipe ; e, wire frame to support oyen ; f, alcohol lamp or gas jet to boil water ; .-, block 

 to support oven ; //, ring in blowpipe to clamp larvae ; i z', glass cover (made in two pieces) 

 to , ,/ver oven, allowing operator to see larvae and retain the heat. 



call the " Ox Roast ") to the tiniest Micro, has met all the re- 

 quirements mentioned, not the least being economy of time. 

 All the time required is for cleaning the larva and placing it 

 on the blow pipe ; you can then turn your attention to other 



