r 2 4 1 
The Kvatcr pan'of^ which is the heft known, both 
on account of its colour, fometimes red, which makes 
the vulgar believe that the water is clian2:ed into blood, 
and from the works of S‘'ccffer Bakery Geoffro)\ and 
Swammerdam y is reprefented by the latter as herma- 
phrodite, though it be different in fex, and have the 
parts of generation double. 
The knowledge of thefe infedls has been almoft 
entirely negledled, though in reality very interefting ; 
not to fpeak of their wonderful make, the difference 
of their motion, and their fingular mode of copulation, 
are worthy of our enquiries. Let it be fudicient to fay, 
that we Iwallow them and their ftiiells, either living 
or dead, both in our viduals and drink ; fo that I 
ihould not be furprized, if fome time or other they 
were found in our inteftines, or in thofe of beafts, and 
feveral of our difeafes attributed to them. 
I propofe giving the defeription and hiftory of thde 
infedfs, with their figures drawn to the life, as feen 
by the microfeope: this I fliall do in a work which 
I am projefling. To render it more compleat, I beg 
the favour of all naturalifts to communicate their ob« 
fervations, which I ftiall not omit to give them the 
credit of, and at the fame time, if they ftiould find 
any other fpecies, to fend them to me. It is very eafy 
to tranfport thefe infeds, as they live very well in a 
fmall quantity of water for feveral weeks, without a 
necefiity of a change. With thefe hopes I have 
added a lift of the feveral fpecies, which I have met 
with in the waters of Friderikftall. It is after 
having examined and compared them, at different in- 
tervals, at all ages, and in all feafons of the year, that 
I venture to pronounce upon their fpecific differences. 
1 ftiall 
