is the length of the Image Tranfverfe, but Parallel to the length of 
the Prifm. Out ofallwhichevidently follows, that the Expe- 
riment wasiioc made in a clear day ; nor with the Prifm clofe to 
the Hole ; nor yet with the Image TranfverfeCas is now affirmed,) 
but by a bright Cloud, and a Parallel Image (as I conjeflured ;) 
and I hope you will alfo now fay, I had good reafon fo to conje- 
fture, fince it fo well agrees with the Relation . And Experience 
will alfo fliew you, if you pleafe to make tryal, as it was made , in 
a dark Chambcr^and obferve the difference between fuch an Image 
made by a bright Cloud, and another made by the immediate ray es 
of the Sun; For, the former you fliall always find Parallel, with 
the Ends Semicircular ; but the latter you fliall find Tranfverfe, 
with the Ends Py ramidical, as aforefaid, whenfoever it appears fo 
much longer than broad. 
More might be faidout of the fame Relation, to fliew that the 
Image was not Tranfverfe. For, if it had been Tranfverfe , Mr. 
NewUnyfo well skilled in Opticks, could not have been furprifcd 
(as he fays he was) to fee the length thereof fo much to exceed the 
breadth ; it being a thing fo obvious and eafie to be explicated by 
the ordinary Rules of Refraftion* That other place alfo , in the 
m^tpMgf 307 7.(where he fay s,the Incident Refraftions were made 
in the Experiment equal to the Emergent,) proves again that the 
faid oblong linage was not Tranfverfe, but Parallel. For it is 
irtipoflible, the Tranfverfe Image fliould be fo much longer than 
broad, unlefsthofe two Refraftions be made very unequal, as both 
the computation according to the common Rules of Refraftion, 
and Experience teftifie. Wherefore Mr. Nemon had no reafon to 
rax ^in fAg, 409 !♦) KFardies of HalIucination,^br mdiWmg infage 
4088. thofe two Refrafiioiis very unequal: For, that learned 
Optike very wellfaU^ that in a clear day fo great an inequality 
of length and breadth couldvnot be made, unlefs thofe two Refra- 
Sions were alfo made very unequal. Thefe places, I fay, might be 
added to the former, and further here explicated if need were ; but 
there being no need , I ceafe to detain you ^iny longer herein. 
Mr. 
