The BOOK of 
the forceps or jaws which are beneath them; 
having two teeth and conftituting part of the 
mouth. The horny parts and the claws of the 
legs are likewife of a reddifh brown. 
The exuberant wings infenfibly change their 
pale colour into a yellowifh one, which, in 
procefs of time becomes a bright blue, and at 
length a brown black. The whole body of 
the creature is by little and little ftained with a 
pale yellow colour, and the blackifh {pots in 
the back, where it conftitutes the upper part of 
108 
the belly, are changed by degtees into a deeper 
colour. 
The difference between thefe creatures with 
refpect to their fex is another point very wor- 
thy of notice. For the eyes, Tab. XIII. fig. 
iv. a, of the male, are twice as large as thofe 
of the female, fig. 111. but the body of the 
male is commonly much lefs than that of the 
female, which is the cafe in infects in general, 
as far as I have obferved ; and it feems to be 
ordered very prudently fo by nature, or more 
properly, by the very wife Creator, in order to 
give the due room toa large number of eggs. 
The male in this fpecies has the tail very long, 
Ce ees 
NAOT OU RIE; 
or, 
and befides he has three or four other appena 
dages, placed partly on the fides, partly under 
them, which can fearce be diftinguithed in the 
females. The male that I exhibit in fig. rv. 
of Tab. XIII. is the largeft of all I have feen, 
though much larger females may be found. 
As to the difpofition and manner of this 
infect, Ican fay little from my own obferya- 
tion: but one thing I may venture to affirm, 
that among all the {pecies of infects, I never 
faw any one more mild, gentle, or innocent. 
For in whatever manner it is treated, itis al- 
ways calm and peaceful, and when left to itfelf, 
it immediately goes to work, and begins to dig 
a cell for its habitation. I have obferved indeed 
in the fmalleft f{pecies, that when rudely 
handled, it bends its head towards its breatt, 
and makes itfelf fomewhat ftiffer. Of all the 
actions of this creature none is more admirable 
than the agitation of the branchie or gills, 
Tab. XIII. fig. 1v. which- adhere to either 
fide of its body, for thefe are fo orderly, di- 
ftinctly, and continually fhook and_ vibrated, 
that the mind, when intent on thefe incompre- 
henfible movements, is filled with aftonifhment. 
P, VI. 
The anatomy of the internal parts of the Ephemerus, 
H AVING briefly defcribed the egg, 
Worm, food, age, external parts and 
difpofition, fo far as I obferved, of our little in- 
feét, what fhould naturally come next into con- 
fideration would be to explain its change. But 
as this is performed fo haftily, that it confifts 
almoft only in the cafting of two coats or skins, 
and the difplaying or unfolding of fome limbs 
and parts before covered, in order to underftand 
the difference between the {wimming Worm 
and this flying infect the more diftinétly, I think 
it better to defcribe its internal parts firft ; and) 
the rather, becaufe all thefe parts under both 
forms of this creature may be in this account 
taken notice of. 
Though in defcribing the internal parts of the 
E{caor Worm of the Ephemerus, I fhallenter upon 
them ina method not yet obferved by any perfon 
that I know of; yet, according to the example 
of Clutius, I fhall not complain of the fcarcity 
of books, treating of this fubject, nature hertelf 
being the beft interpreter of all her works: 
books are to be admitted no further than as 
they exprefs the truth of what fhe reprefents to 
our fenfes. Iam therefore in pain for thofe, 
who, relying on the experiments related by 
others, frame innumerable fictions, and there- 
with deceive their readers with themfelves. it 
cannot be poffible that any perfon relying on 
his own underftanding and judgment, fhould, 
in fuch a variety of experiments, follow the 
ftraight path of truth, and with an unprejudiced 
and candid judgment pafs a juft fentence on the 
obfervations of others, efpecially fince we ob- 
ferve that the moft certain experiments are ob- 
{tinately rejected by many, unlefs they corref- 
pond with their own opinions or prejudices. I 
fhall build only on what I have feen, though I 
may in this perhaps be blamed ; for that not 
having had a fufficient number of the Worms, 
Ihave not been able to bring their diffection 
to the utmoft perfection, fo that in this refpect 
I cannot every where fatisfy my own inquiries. 
But I have long fince learned, that the works 
of God are as inexhauftible and incomprehen- 
fible as his own perfect nature; fo that thefe 
things ought not to be contemplated by us for 
any other purpofe, than that we fhould be 
humbled by .a due confcioufnefs of our igno- 
rance, and be obliged to adore their Creator, 
and love him truly. 
In order to make the obfervations I have to. 
offer as clear as poffible, I fhall at the fame 
time declare the method, which I made ufe 
of in the year 1670, to determine the true 
difleCtion of the feveral parts; for it is by no 
means my intention to deceive either myfelf 
or others. Before I proceed to the defcription 
of the internal parts, I fhall, in order to affift 
the memory, briefly enumerate what parts are 
Obfervable outwardly in the Worm of the’ 
Ephemerus, as alfo what inward parts I found 
in the male, and what in the female. 
The external parts of the Worm are the 
head, fkull, horns, eyes, teeth, mouth and 
tongue, together with their hairy membranes, 
which are like thofe in the Crab kind. The 
breaft; legs, claws, wings, belly, and what ap- 
pertains 
