( .6^ ) 



fajy .and dare mt guefs^ hecaufel fnd ConjeCttire oftner to h 'wrong than ris-ht 

 in theje Matterst Indeed nothing but ocular Demonfiration is to be trufl-^ 

 td berc. 



The other Species of Aurelije ha^ve Urge Heads fcmeivhat Uke a -wooden 

 Mallet : Speciwens whenof are marked Lr, b. in Nrs. i^ ij^ 4. Thefe bai^ 

 m Lcgsy and jwim about the Hatcr by judden firong Jerks of theirTnl. 



This Species may be alfo divided intofwoforts^ either fuch as fpringfrom 

 TVorms, or Juch as do not. 



The AnrQlix from Worms may again be fubdivided intofuch as havegreat 

 cr fmall Headsy longor (hort Antennfe^ large or lefjsr Feathers in theirTails.. 

 Some alfo ha^ve Top-knots like tbcTufts on Dandelion Seeds • others have only 

 plain Horns, Thefe Antennas or Homs I take to be theSpiracles- in mofi^ or 

 dl thefe Aureliaj. Lajtly^ Some of thtfe Aureli*e are red like their Varmt 

 Worm ^ others are of light, othtrs ofa d^rk broivn Colour^ &C. 



E^very fort of thefe Aureliae I ha^ve jeen to become Gnats, fcme oftheMale^ 

 fome of the Female Kind, as Swammerdam hath difiingui^ed thtm by the 

 Feathers on tke Maks Heads. , 



All theje Aurelia? proceed from red Worms of abcut 7 or 8- of an Inch long, 

 Oneofvjhich I havefent in the Specimen marked Nr. 1. Lr. a. but fpoiled (as 

 many of them are) by drying. Thts Worm is z/ery commony and fwimmeth 

 about in the Water by lapping himfelf backward and forward ivith leifureh 

 Motiony not rapidly crinkling hts Body as the Worm doth (Nr. §. Lr. a.) 

 from ivhich proceedeth a fmall blackijh Aurelia, Lr. b. and thence a fmall 

 black Fly^ Lr. c. 



Thefe Worms ivhen they change to Aureliae ha^ve that part of their Body 

 fwelled next their Headj and tbe Tail becometh flatter. But I never could 

 perceive them to caft any Skin^ as they do ovhen they are grown up to per-^ 

 feB Gnats. 



The other fort of thefe club-headed Aurelise are fuch as do not proceed from 

 Worms ^ butfromjinimalcules, Tvhichjeem to be Aurelix or tiymphx them- 

 felves. Of ivhich I have as yet met with but two forts^ but haz>e Jvme reafon 

 to think that there are more. Of one fort there is a good Cut in Swammer- 

 dam de Infed:. Tab. 2. Lr. A. But I have however fent you a Specimen^ 

 Nr. 5. Lr. a. Tbefe Nymphae, called Vermiculi by him, are fome ef a 

 greenijh TelloWy and fome of other Colours^ and end in Aureliae in Swam^ 

 merd. rLr.C.) in my Specimen (Nr.Ti,, Lr. b.) Ih&Gnats bred in thefe 

 Aureliaej have all two Feathers on their Heads, ormore^ which are,very 

 pretty in a Mierofcope, and of admirable Make. The Gnat it felf is Nr, 3. 

 Lr. c. and whence thefe Nymphae proceed, wbether from Maggots, or &c. 

 Iknow not. 



Thefe Nymphae, or Vermiculi, Swammerdam mnketh to hmg with their 



Headi 



