{Mt) 
bright Sun , or that k might be fome duft in the Aire. 
The great Microfc<f.e being fitted in the day-light for this piece 
of Fifh,we examin'd it that night, and it yielded no light at all, 
either by the view of the Glafs,or otherwife. 
Finding it dry, I thought that the moifture of Spittle 3 and tou- 
ching of it ? might caufe it to ffiine : and fo it did, though but a 
very little 5 in a few fmall fparks, which fobn extingnifh’t. This 
we faw with the bare eye ; not in the Glafs. 
The Fifh were not yet fetide, nor infipid to the Left difcer- 
ning palats: And I caufed two Fiffi to be kept for further Try- 
alb two or three daies longer , till they were fetide in very hot 
weather 5 and then I expedted more brightnefs, but could find 
none, either in the water, by ftirring it, or in the Fifh, taken out 
of the water. 
And fome Trials I made afterwards with other boyld Mack- 
rels (as is abovefaid) with like pickle, but fail’d of the like fuc* 
cefs. 
This feafon ferves for many Trials in this kind, and by better 
Micr of copes, or better ordered. And in thefe Vulgarities we may 
perhaps as well trace out the caufe and nature of Light , as in 
Jewels of greateft value, 
Some Considerations 
Touching a Letter in the Journal des Scavans of May 24. 
1666 . 
In Num. 9. of thefe TranfaUions were publifh’t the Schemes 
and Defcriptions of certain Wales of Sounding the Depth of the 
Sea without a Line , and of Fetching up Water from the bottom of its 
together with fome Experiments already made with the former 
of thefe two Contrivances. The Author of the French Journal 
des Scavans found good , to infert them both in his Journal 
of May 5 1 but in another of May 24.. intimates, that the faid 
Schemes and their Defcriptions are not very clear and intelligible 
(he means,that they were not well underftood by French Rea- 
ders;) proposing alfo fome Difficulties, relating to that Subject, 
and efteemed by him neceflary to be fatisficd , before any ufe 
could be made of the faid Inftruments. 
Upon this occafion,the Auffior of thefe Trafts thinks fit, here 
to reprefent, Firft, 
