Royal Society. 309 
hurricane hath been in Antcgoa and St. Cbrifiopher's^ thofe 
/hips that were in the latitude of 20 degrees, had no hurricane, 
but conftant wefterly winds reafonably fair, and then there were 
no hurricanes in T^ermuddSy and when the hurricanes were at 
'Bermudas^ the Leeimrd or Caribbee Ifiatids had none^ nor 
had thofe iflands the hurricane when Barbadoes had \x. Ic 
may be further objected, why the hurricane was never known to 
go farther to the wefcward than 'Porto RlcOy which lies in or 
near the latitude of thole iflands of St. Cbriflopherh ^ To this 
he anfwers, that from Torto Rico downwards, both that as well 
as Hifpaniola and other adjacent iflands are of vaft preatnefs 
and have very high lands, that of themlelves mofl commonly give 
reverial or wefterly winds at night thro' the year 5 for there, for 
the reafons aforefaid, the eafterly wind towards night doth calm, 
and thole lands afford a land-wind, which the other illands can- 
not do, by realbn of the fmallnefs of thole Caribbee I/lands^ but 
very near the fliore, the trade-wind has its full force till this ge- 
neral ,whirl-wind comes for the reafons aforefaid. He imagines 
likcwile to the Ibuthwards of SarbadoeSy, where the Tornado's 
come frequently, there are no hurricanes 5 nor was there any at 
Barbadoes when thele Tornado's commonly came there, which 
made Ibme fmali reverfal, tho' it was but for two or three hours • 
yet the eafterly wind, giving fome way by the fun's declining 
from that Zenith, prevents this furious reverie, where it hath no 
vent, till it is forced by the violence of the two winds. 
Of the \Polarity of Drills 5 by Mr. Ballard. Phil. Tranf. 
N° 24^. p. 417. 
I. Ti J" R. Ballard caufed fix or feven drills to be made, an-d 
jLVJL the bit or point of every one became a North Pole by 
hardening only, before they ever came to be worked either in iron 
or any other matter, fo that he could not fuppole that thole 
found in the fliop had got their polarity fo much from their after 
ufe, as from their firft make. 2. That pieces of plain iron, in 
Ihape like drills, that is Ibmething long and imall, do always 
change their Pole as they are inverted, the end downwards being 
ever the N. Poky he found not always true 3 for tho' it hold gene- 
rally in fuch fmall pieces, and always as far as he could yet find 
in pieces of any bulk, as large hammers, anvils, and iron bars of 
windows, yet he found that leveral fmall pieces ot fteel, fuch as 
the drills are made of, had fixed Poles^ one end north, the other 
fouth, in whatever poftures he held them 3 Ibme of thele were 
very 
