t^RITISM HLOODSrCKKRS 



239 



; you try to put your liiuui on 

 slip through your liiiLjcrs ; you 



do tliey \vri_i4<^le 

 them, and they 

 have cauj^ht one 

 now, and, hi 

 presto ! before 

 you know it, he 

 is twirling off to 

 the other side 

 and disportinj^ 

 himself j^aily in 

 aquatic j^ambols. 

 Nevertheless, 

 he is a crea- 

 ture well worth 

 observinif, this 

 larva. (jet 



him still under 

 the microscope 

 (which is no 

 easy matter — 

 to insure it, you 

 must supply hmi 

 with only the 

 tiniest possible 

 drop of water) 

 and you will then 

 perceive that he 

 has a distinct 

 head, with two 

 large dark eyes, 



and that behind it comes a j^lobular body, and then 

 a tail of several quickly moving segments. No. 4 



NO. 4. — THK MOSrn'no-1 AKVA IN MIS 

 KAVcM'Rri'K ACT Ol- M \NI)1N(. ON HIS 



m.Ai) AM) hrkaiiiim;. 



