t 6*8 ] 
V- „ 
during the fummer of the year i744,that the feveral 
©bfervatiom- related in that paper were made, and 
what refults from thofe obfervations, concerning the 
figufte of thefe little animals, and their manner of 
multiplying, is fufficient, if I am not greatly mif- 
taken, to convince any obferver, that they well 
deferve the attention : of the eufious. I have accor- 
dingly fince, miffed no Opportunity of purfuing my 
enquiries concerning thefe infefts, and whilft I have 
been fearching for them in different waters, I have 
occafionally difeover'd feveral other forts, to which 
I was before a ftranger; but to which I have not 
been able to refufe fome fhare of my application alfo. 
The relations I found thefe new fpecies of ‘Toly pi 
had to thofe I was already acquainted with, and 
feveral particulars in which they greatly differed, 
equally determined me to obferve them all, with as 
much care as I was able. 
This undertaking by degrees became both diffi- 
cult and extenfive, yet as I was well perfuaded, that 
if it could be efficiently purfued, it would greatly 
contribute, both to re&ifie and to enlarge our no- 
tions of Nature; I have often regretted both the 
want of leifure, and the want of affiftance for car- 
rying on the work. By affiftance I mean the advan- 
tages I might have received from the diligence, from 
the ability s, and from the judgment, of fuch other 
obfervers, as fhould have been willing to joyn with, 
me in fuch an undertaking. 
The more minute the obje&s are, upon which we 
are to make obfervations, the more diffident Ihould we 
be of thofe obfervations themfelves. It is in thefe 
cafes not fufficient to repeat fuch obfervations feveral 
times 
