C 719 3 
far enough from the Focus > for I was obliged to make 
ufe of a Looking-glafs be.caufe of the Sun’s Pofition : 
I once, indeed, tried to perform it without, but found 
the dired Rays too hot ; but a Glance or two I had 
of it, convince me it might be feen to much greater 
Perfection. — -Another Difficulty is, that the Tube is 
rather too thick, and befides is apt to be fmeared 
with the Tail of the Animal: However, it requires 
Time and Patience to perform it ; yet, in the Manner 
I have feen it, it is to me the molt entertaining Sight 
my Eyes ever faw. 1 am not without Hopes, that 
I {hall be able to remove fome of the Difficulties my- 
felf, if God give Health and Opportunity this Sum- 
mer j if nor, I wiffi a fitter Perfon may attempt, it, 
and fucceed : It may he ufeful, perhaps, as well as 
pleafing. I am 
Tour moft obliged , 
Tooting, March 3 1. 1741. and humble Servant , 
H. Miles. 
I forgot to mention, that the Blood appeared a 
little difcoloured, but not more in Proportion than 
it appears to be when you view it in the common 
way ; and that the Tube, with the Lens receiving the 
Sun’s Rays, was exadly parallel with the Horizon, 
and perpendicular to the Plane of the Screen which 
received the Image. 
XIV. A 
