LA Ne D 
How long ‘it lives. ob. 
Naturally never dies afhore. : ib. 
Its life is very fhort, but full of mifery and diftrefs, and 
why. 7b. and following. 
_ Does not engender either in the bofom of the water, 
afhore, or in the air. ELOsern7 
Where, and in what manner, it generates. 102, 
ZLOs 117 
Ephemeri, male and female, their external differ- 
ences © 116 
‘The male changes its fkin twice, the female but once. 74. 
The female ejaculates its eggs on the furface of the 
water. 103, 116 
Thefe eggs, when impregnated, fall to the bottom, and 
in what manner. 104, 
‘They afterwards produce fix-legged Worms. pi 
The male impregnates the eggs fhed by the female on 
the furface of the water, by pouring its feed upon 
them. 117, 221 
Various fpecies of this infect. 118 
‘The Author has fome of them in his colleGion. 96 
Ephemerus, of Hoefnagel. 118 
The fmaller. 118, E19 
Ephemerus has no Nymph. 113 
Its Worms, what places they haunt. 104, 105 
‘To what order of neutral changes they belong. 113 
Why called Bank bait and Flying bait. 106 
Follow the increafe aud decreafe ofrivers, and why. 105 
‘The tameft of all infeds. 108 
Of a very flow growth. 104 
Grow for three years before they change, and acquire a 
form that is not to lait above five hours. 406, 134 
Are very vigorous. 106 
How they may be kept alive, and fent abroad. 2b. 
In what manner they fhed their floughs. 96 
Colour of the Worms, and its flow change. 107, 109 
‘Their manner of {wimming. 104 
Feed upon mud. 105, 106, 109 
Their tubes, and in what manner they formthem. 105 
DireCtions for diffecting them. 109 
‘Their internal parts. 108 
Rings. 106 
Gills.” “1677 Their wonderful motion. 108 
‘The head, with its parts; the eyes, horns, pincers, or 
jaw-bones ; thorax, and its parts; legs. 106, 107 
Its little tails. ib. 
Folliculi, or little fheaths, of the firft pair of wings, 
and the fecond pair. 1b. 
Its rowing fins. , Iit 
Its internal parts, defcribed. 108, and following. 
Its heart. II 
Its pulmonary tubes ; their main trunks; their diftribu- 
tion, conftruction, colour, change of fkin, external 
orifices. 109, III 
The manner of examining them. THO Woe 
The Worms of the Ephemerus, their inteftines, {mall 
gut, colon, and ftraight gut; the valves, fituation, and 
pulmonary tubes, belonging to thefe parts. 109 
‘The fpinal marrow. III. Its air ducts. 1D 
‘The manner of finding it out. ib. 
‘The membrana adipofa, and fat. 109 
Mufeles of the abdomen, and of the ftraight gut, 7d. 
Optic, and other nerves. III 
Eyes, their conftruction with the nature of the infect’s 
vilion. se 
Oefophagus or gullet. 109 
Peritoneum. ib. 
‘ Blood watry. ib, 
Stomach, and its fituation, and pulmonary-tubes. ~ 7d. 
‘Their change very fudden. 114, 
General and particular figns of their near mutation. 
TDS UES. 
They become tranfparent when about to change, and 
why ? 109 
How employed at that period. 135 114 
Obftacles to their change, life and growth. 113 
How their mutation may be kept back, at the time they 
are juft about to perform it. IT4. 
The change of their wings, ard how thefe parts can ex- 
pand themfelves fo fuddenly. ' 1b. 
Of their tails, horns, eyes, and feet. 115 
In what the other changes differ. 114 
VOX, 
The manner of obtaining a fight of tiem. 11g 
‘Their employment after their firft mutatlon, 114, x16 
In what places they caft their fecond fkin, and what parts 
they lofe on that oecafion. IT5 
“Their employment after their fecond mutation. 116 
‘The external difference between thenaale and female. 1047 
The internal parts of the female. ‘ 108 
Its ovary. E12. Iteggs. 7b. 
The male diftinguifhable by the largenefs of his eyes. 109 
His internal parts. ~ 108 
Organs of generation. 112. Seed 7. 
Worms of the Ephemerus, of various kinds, differing 
in fize according to their different ages. 104 
ESCA, or bait, what it is. 106 | 
EYES, of infects, do not confift of a congeries of little 
eyes, each of which like ours. 2Ir 
‘The eyes of many infects are befet with hairs. 212 
‘The colour of them is various in different creatures, and 
18 
FAT, of large animals, when viewed by the micro{cope, 
how it appears. 137 
Of a man and beaft confifts of {mall grains. 162 
‘The manner of examining it. fyb. 
FEMALES, of infe&ts, their bodies larger than thofe of 
the males, and why ? ibe 
FERN, the male, defcribed. P. HT. 118, x51, 152,153 
FISHES, hear, and have the labyrinth of their ear won- 
derfully formed for that purpofe. 50 
Found on the tops of mountains, and other places 
How they came there. 103 
Do not copulate. Plage 
Are fecundated by being fprinkled with the fperm ot 
the male. P. Il. gar 
Their gills wonderfully conftructed, having red blood. 
Rigen lar y3 
FLYING HOGS, Beetles fo called. ; We 
FLEA, produced from a nit, in which it changes to a red 
colour. 20 
A Flea found in cifterns of water, defcribed by Goe- 
dart, by the name of the water Loufe. ib. 
Produced perfect from the ege.” 40 
In what places found ib. 
Enclofes a little bubble of water in. its tail when it 
dives 326 
‘The water aborefcent Flea defcribed 840 
and followin 
FLIES, belong to the third order of mutations. 122 | 
Are not produced by putrified flefh, but by eggs and 
worms depofited in it. 
PEM. 35 
Many of them iffue from a fingle Chryfalis or Nymph. 
; ; 122 ah 23, 
Sometimes they iffue from the little nets in which Spi- 
ders wrap up their eggs. 24 
How they buzz in flying. 217 
Some of them, on quitting the Nymph ftate, are much 
larger than they were before. 183 
Some of them have four wings. 231. which are produ- 
ced from Nymphs formed within the Aurelia. P. II. 36 
‘The manner in which they bury their eggs in the leaves 
of the Thiftle, feen by the Author. P. IL. 89 
‘The Author informed that Flies bury their eggs in the 
bodies of Caterpillars, whofe fkins they pierce for that 
purpofe. Pell eeOO 
Flies, how they differ from Bees. 235 
‘Their heads bruifed on paper leave a red ftain, produced 
by the uvea. 212 
‘Their Nymphs plainly exhibit the future infec. 3 
Why, and how far the Nymphs of Flies differ from the 
Nymphs themfelves, from other infe€ts, and their 
Nymph. | 45 5 
FLY aquatic, belongs to the fecond order. 96 
Carnivrous, called Czfar. ; ae 122 
Chryfopis. ib. 
Horfe, belong to the fourth order of mutations. 628 
Florilega, black. 122 
Goedaert’s, fprung from Worms that feed on the body of 
Cabbage-Caterpillars, belongs to the fourth order of 
mutations, and why. of AI Shap GNSS 
Sprung from the Worm without feet found on Cab- 
bages. P. I, 98,99 
——— ee a ee 
if 
