7yiah}ng^ at ledTt dt this time ^anj Reflexions on them. And the rather indeed^ he" 
caufe I enjoyed fo little health, when I was making the Experiments, that 'tWM 
not fit for me to engage in Speculations, that would much exercife my thoughts^. 
Vphich^ J doubt ^ have been more gratified^ than my health hath been by the bare 
Trials, ^hich are mofl feafonably made at hours unfeafonahle for one^ that $s 
not welL 
p 0 s r s c K I p r. 
Sent by the fame Noble Author from the fame place^ 
December 6. 1667. 
MT C0ndition in pint of health king not much improved fitsce 
I writ to in Odober /4/f , when I Jha/l have added, that I 
have not thefe five or fix weeks been able to procure any Shining 
Wood (except eni fingle piecey which though Urge^ was fo iS condi- 
tioned^ that it afforded me but one T rial)you will not^ I hope^ expe^if 
that i fhould adde mttch to the Experiments I formerly fent you about 
the Relation 'twixt Light and Air. But however ^ ftnce the fubjeB k 
New and Noble ^ and fince your curie fttj about other matters has been [0 
welcome and ufeful to the YitmoG^ I fliaU not decline even on this oc- 
casion to comply with it ^ and the rather y becanfe 1 half promised yo^ 
fome Addirionals a good while fince^ and beoaufe too, thatthough^ 
what I jha/l acquaint pu withy may feem to be but a Con firmation of 
two or three of the former Experiments ^ yet^ be fides that ''tis ofthem^ 
which mo^ needed a Confirm^tiony thefe Trials will alfo afford ferns 
Circum fiances y that will not, I think ^ be unwelcom. 
Experiment XI. 
TO examine then the Conjedure, mentioned in the lafl: Ex- 
periment, That the darablenefs of the Light in the Shi" 
ning Fifh, in fpighc of the withdrawing the Air, might proceed 
in great part from the Vividnefs of ir, and the beauty of the mat- 
ter it refided in, rather than from theExteEit of the Luminous 
Body in comparifon of the fmall pieces of Shining Wood, I hither- 
to had made my Trials with-, I put in, the above-mentioned 
piece of Wood^ whofe luminous fuperficies might be perhaps ten 
or twelve times as great, as that, which the Eyefawac once of 
