( * 3 * ) 
IH. As to its Brightnefs, perhaps you may be fur* 
prized when I tell you that I could eafily read by it, tho* 
I was 9 or io Foot above it from the Surface of the 
Water 5 as I did particularly on the 12th of June and the 
10th of July 1704. But I muft inform you that I could 
read only the Title of my Book, which was in large 
Letters : Yet this feemed incredible to thofe I told it 
to ; but you may believe it, and I allure you that it is 
a real Truth. 
IV. As to the Extent of this Light, fometiraes all the 
Wake appeared Luminous to joor 40 Foot diftant from 
the Ship 5 but the Light was very faint at any confide- 
rable didance 
V. Some Days one might eafily diftinguilh in the 
Wake fuch Particles as were Luminous from thofe that 
were not : At other times there was no difference. The 
Wake feemed then like a River of Milk, and was very 
pleafant to look on 3 as it appear’d particularly on the 
loth of July 1704. 
Vh At fuch times as we could diftinguilh the bright 
Parts from the others, we obferved that they were not 
all or the fame Figure : Some of ’em appear’d like Points 
of Light * others alraoft as large as Stars as they appear to 
the naked Eye. We faw fome that looked like Globules, 
of a Line or two in Diameter $ and others like Globes as 
big as ones Head. Oftentimes thefe Phosphor's form’d 
themfelves into fquares, of .3 or 4 Inches long, and one 
or two broad. Sometimes we could fee all thefe diffe- 
rent Figures at the fame time $ and particularly on the 
12th of June, the Wake of the Veflel was full of large 
Vortices of Light and thefe oblong Squares, which I 
have been fpeaking of. An other Day, when our Ship 
failed (lowly, the Vortices appeared and difappeared a* 
gain immediately like flafties of Lightning. 
VII. Not only the Wake of a Ship produces this 
Light, but Fifties alfo in fwimming leave behind 'em a 
lumi- 
