WITH NOTES. 481 



Marquis and his predecessors, assuming their total 

 ignorance of what is here so clearly and graphically 

 described. 



Again, Van Etten in the fifth section of Problem 

 LXXXV. treats u Of a fine fountaine which spouts 

 water very high, and with great violence by turning 

 of a cock.&quot; page 193. &quot;Let there be a vessel made 

 close in all its parts, in the middle of which let a pipe 

 open neare the bottome ; and then with a squirt squirt 

 in the water (stopped above by the cock or faucet) 

 with as great violence as possible you can, and turne 

 the cock immediately. Now there being an indifferent 

 quantity of water and aire in the vessel, the water keeps 

 itself in the bottom, and the aire which was greatly 

 pressed, seeks for more place, that turning the cock 

 the water issueth forth at the pipe, and flyes very high, 

 and that especially if the vessel! be a little heated. 7 The 

 concluding sentence would no doubt afford a mind like 

 that of the Marquis of Worcester s abundant matter for 

 experimental trial, if ever consulted by him, either in the 

 original, or in the translation of 1G33. 



The following extract from Van Etten s 83rd Pro 

 blem, &quot; Of Cannons or great Artillery,&quot; affords strong 

 presumptive evidence (taken along with other extracts) 

 of the Marquis s acquaintance with the work. The 

 Problem is divided into two parts, of which the first 

 alone need be noticed, namely, &quot; How to charge a 

 cannon without powder.&quot; It is observed &quot; This may be 

 done with aire and water, only having thrown cold 

 water into the cannon, which might be squirted 

 forceably in by the closure of the mouth of the piece, 

 that so by this pressure the aire might more condense, 

 then having a round piece of wood very just, and oiled 

 well for the better to slide, and thrust the bullet when 

 it shall be time. This piece of wood may be held fast 



2 i 



