»( 6x0 ) 
Powers of the quantities, c, dy &cc. z"" the Z/ptcra 
(as Oughtred calls 'em) prefixc to thefe Produds, To 
find ail the Produds belonging to the fame Power of 
2, to that Produ(9-, for inftance, whofe Index is w+r 
(where r may denote any integer Number) I divide 
thefe Produds into (everal Clajjes ; ihofe which imme- 
diately after fome certain Power of a (by \\ liich all 
thefe Produfts begin) have I call Produhs of the i^^^ 
Claffts ; For Example d^"^l^e is a Produft of the i^^ 
Claffis^ becaufe b immediately follows a"^"^ ; thofe which 
immediately after fome Tower of a have c, I call Pro- 
duces of the Clajfis^ fo a'^'hcdis a Produd of the 
^^Cia^^ls ; Thofe which immediately after fome Power 
of a have I call Produds of the 3^ ClalTis, and fo 
of the reft. 
This being done, I Multiply all the Produds belong- 
ing to z'^+^'-' (which precedes immediately z^'^^^ by b 
and Divide 'em all by zM Multiply by c and Di- 
vide by <2, all the Produds belonging to Except 
thofe of the i^^Claffis; 3** I Multiply by J and Di- 
vide by a all the Produds belonging to 2^+^-3^ Except 
thofe of the i-^ and CiafTis, 4* I Multiply by e 
and Divide by a all the Terms belonging to 2^+^ 4^ Ex- 
cept thofe of the i'^, and 3"^ Clafis, and fb on, till 
I meet twice with the fame term. Laftly, I add to all 
thefe Terms the Produi^ of a"^'^ into the Letter whofe 
Exponent is r+i . 
Here I muft take notice that by the Exponent of a 
Letter, I mean the number which exprefles what Place 
the Letter has in the Alphabet^ fo 3 is the Exponent of 
the Letter c becaufe the Letter c is the 3^ in the Alpha^ 
ljet\ 
It is evident that by this Rule, you may cafily find 
all the Produces belonging to the feveral Powers of 2, 
if you have but the Produd belonging to , viz. a"". 
To 
