2 o 6 Of the Gnat. 
is only while they are entering, and con¬ 
tinues not when the Gnat is fucking: nor is 
its Stinging out of Revenge, but from mere 
Neceffity to obtain a proper Suttenance. 
The Gnat 's four Darts are fhewn Plate 
XIII. Fig. IX. a. b. c. d. 
A Gnat's Eyes, which form the greatett 
Part of its Head, are pearled, or compofed 
of many Rows of little femicircular Protu¬ 
berances ranged with the utmoft Exactitude. 
What thefe Protuberances are, and the Pur- 
pofes whereto they ferve, will be explained 
when we come to treat of the Eyes of In- 
fedls . 
The Motion of the Itneftines may be feen 
In the tranfparent Parts of this Animal; and 
upon Diffedion many curious Difcoveries 
may be made. Mr. Leeuwenhoek fays, 
he found in the * Semen of the Male num- 
berlefs Animalcules fmaller than thofe in 
Pleas, and in the Female a furprizing Quan¬ 
tity of Eggs. And, indeed, the Spawn of 
this In fed: is amazingly great in Proportion 
to its Size, being feen floating on the Waters 
(though always fattened to fomething to pre¬ 
vent Its fwimming away) fometimes above 
an Inch in Length, and half a quarter in Dia¬ 
meter ; the Eggs (each of which has a little 
• # liEEUWE'N. Arc* Nat » Tom. IV. p. 22. 
black 
