( *01 ) 
Epidermis, ’which was probably a Prolongation 
of the Nervous Papilla grown to about the Sisse 
of common Twine Packthread ; and thefe fiand- 
ing as clofe together as the Brifiles in a Brup, 
feemed , like them, to be all porn op even, and 
of the fame Length, viz. about half an Inch 
above the Skin. 
Fig. 3. Shews fome of thefe Triples, or Stumps, 
magnified ; where it is vifible that fome of 
them are flat at Fop, others concave ; fome 
pointed like a Cone, and others very irregulan 
II. Conjectures upon the Nature of Intermitting 
and Reciprocating Springs. iBy Mr. Jofeph 
Atwell, F. <%. S. 
B EFORE I offer the following Thoughts to the 
Confideration of the Society, I beg leave to pre- 
mife fomething upon the Nature of Philofophical Con- 
jectures in general, and the Senfe in which I would 
be underftood to propofe thefe in particular. 
A juft and fatisfaftory Account of any one Phe- 
nomenon in Nature, cannot be expected without a 
true and perfect Hiftory of the Fa<Et. This is feldoin 
to be met with : Thofe who live neareft the Place 
of any natural Curiofity, and have the belt Oppor- 
tunity of making ' proper Obfervations upon it, fel- 
dom regard what Time and Ufe have rendered fami- 
liar. On the other hand, Strangers and Travellers^ 
inclined to make a better Enquiry into things of this 
Kind, are too often, if not always, in want of Time* 
Rr % as 
