ina deftgnedtomakeohfervations about the Light of^oittn Fiflies ^ 
and having in order thereunto can fed a competent number of them to 
be bought J not one of them all would jhine, though they were bought by 
the fame ferfonlwas was wont to employ ^ and hung up in the fame 
f lace where 1 ufe to have them put ^ and kept nor only till they began t0 
futrifie^ but beyond thetime that others nfed to continue to fhine^ al- 
though a p^arcelof the fame kind of Fifhes^ bought the week before^ and 
another of the fame kind^bought not many days after ^finned according 
toexfeciafion. What thereafon of this dijctppointmentwasy I could 
not determine-:, My I remember^ that atthetime^tthappened^thewea" 
ther tPasv4riable^ and not without fomedays ofVxoQ, andSmvf, j^or 
is this the oddefl obfervation^ I could relate to you about the uncer- 
tain Mxm^^f fiihtsyif I thought it necejfary ta adde it in this place, 
Ad'vertifement 11. 
Notice mufl alfo be taken in making Experiments with Shining 
Fifti) that their luminoufnefs is not wont to continue very many 
days^ which Adverttjement maybe therefore ufeful, becaufe without 
it we may be apt fometimes to make trials y that cannot be foon enough 
brought to an iffue > andfo we may mi flake the lofs of Light in the FiJh 
to be a deprivation of it caufed by the Experiments which indeed is but 
a ceffation accordingio'the ufual courfe ,pf J^^^^ 
IKJnpwjiQt ^i^hether youwillc^^^^ while to be told of 
a "trial, that we made to fave thofe Criticks a labour, that;^clf^ 
might perhaps demand. Why 'twas not made. We pat therefore 
apiece of Shining Fifh mo a' Wide- mouthed Glafs, abouchalf 
filled with fair Water, ^nd Mving placed this,Glafs in a Receiver^ 
wc e:^uO:ed the Air^ for aj^ood WW to obferve. Whether^ 
^hea ^Ke preffbre of c!he >^ir ;waii;eri^ yec (l^ reafon of 
the Wiitcr that die! b^for?^^^^ imtnsdiattly t^eH- 
ing thie i?i(b) ' t;he:ExK^uj[tiptt of t^^^ i^f^r^ix^^r did iiot deprive the 
' Fifh of i\^^t corita^ of Air^ which it had ioft before 5 ; Wfietherj 
I fay , in this cafe the abftnce of the Air wQold have the fame in- 
fiqeaceon the fliin'ng i^ody, as in the former Experiments f And 
here^ 
