( 17^9 ) 
Now if the Criftaline Humour (which I have fome- 
times caird the Criji. Mufde) in our Eyes, and in many 
other Creatures, coniifts of a flattifti roundnefs, but is 
not perfeftly Spherical, and if the Diameter of the Circle 
made by the Tunick of the (aid Eyes be an inch long, 
the Criftaline Humour in Fifties being Spherical, and 
their Tunick defcribing a Circle, whofe Diameter is two 
inches, allthefe Eyes, as I have faid before, may have the 
fame efFeft. 
After this I took a Whiting, which weighed about 9 
Ounces', and examined the Eye thereof, which defcrib'd 
a Circle of i and^^ Inch in Diameter, and the Dprneter 
of its Criftaline Humour was very near j of an Inch. 
When I difleded the Criftaline Humour of afmall Fifh^ 
and found the inmoft part thereof no bigger than a large 
corn of Sand, 1 obferv'd that the Fibrous particles, of 
which thofe exceeding fmall Scales were composed, did 
Gonfift of as many parts as the uppermoft Scales of the 
fame Humour. 
I did formerly refolveto make a ftrifter enquiry into 
the Eyes of Fifties, but met with fo many obftacles, that 
I cou d not go through with my obfervations, which made 
me delay them till now. 
Now lam fpeaking of Eyes, I cant forbear adding, 
that a certain Gentleman asjit me fome time fmcQ^ why 
Nature has given us Eye lids , feeing that Fifties have 
none, and that his Surgeon could not tell him the rea- 
fon 3 I anfwer'd, that it was abfolutely neceffary tor u , 
and all Land-animals to have Eye-lids 3 for if it were not 
fo, and that tl>e Apple of our Eyes were not moiftned 
many times iti the (pace of an hour, and all the foulneis 
that might fall thereon, waftit away^ our Sirfit or the 
Tumca Corfjea would be fo clogg'd with fillti^ that we 
jfliould not be able to ufe our Eyes 3 befides, the faid 
Tmic would otherwife be parcht up or flirunk with heat, 
become Blind 3 where • 
