( r* ) 
In my Journey to Albany, zo Miles to the EaAward 
of Hudfons River, near the middle of a long riling 
Hill, I met with a brisk noify Brook fufficient to 
ferve a Water-Mill, and having obferved nothing of it 
at the beginning of the Hill, I turned about and fol- 
lowed the Courfe of the Brook, till at length I found 
it come to an End, being Abforb’d, and finking into the 
Ground, either palTing through Subterraneous Paflages, 
or foaked up with the Sand ; and tho’ it be common 
in other Parts of the World for Brooks and even 
Rivers thus to be loft ; yet this is the firft of the Sort, 
1 have heard of, or met with in this Country. 
T. Dudley. 
IV. A Letter from Mr, Leeuwenhoeck, K % Si 
concerning the Mufcular Fibres in feVeral Ani- 
77ials, and the Magnetick, Quality acquired by 
IroHy upon /landing for a long time in the fame 
Tojlure, I 
Delft, Apr. lift, 172a. f 
ft 
To the llluftrkus Royal Society. | 
Honoured Sirs, 
I N a Letter I receiv’d fometime ago from one of bi 
your Secretaries, among many Expreffions of your 11 
kind Acceptance of my Labours, lamrequefted by that I 
Gentle* 8 
I 
