( 6ii ) 
Indices of 2: in the Multiplying Terms is 1+1+4=6; 
the next thing that appears is, that the Index ot z in 
the Mukiply ing Terms ts the fame with the Exponent of 
the Letter to which z is joyn'd, from which two Confi. 
derations it follows that, To have all the ProJufls he- 
longing to a certain Power of 2, you mujl find all tbe 
ProJnds where the Sum of the Exponents of the Letters 
whkh compoje Vw /hall always he the fame with the In- 
dex of that Power. Now this is the method I ufc to find 
eafiJy all the Produfts belonging to the fame Power of 
Let be the Index of that Power, I confider that 
the Sum of the Exponents of the Letters which com- 
pofe chefe Produces muft exceed by i thofe which 
belong to w^^+^ S now becaufe the excefs of the Expo- 
nent of the Letter h above the Exponent of the Letter 
a, is r, it follows that if each of the Produfts belong- 
ing to z^^+^-* is Multipli'd by h, and Diuided by a^ you 
will have Produfts the Sura of whofe Exponents will 
htmJ^r; Like wife the Sum of the Exponents of the 
Letters which compofe the ProduCls belonging to z'""^'* 
exceeds by i the Sum of the Exponents of the Letters 
which compofe the Produfts belonging to z'^+^'-i • Now 
becaufe the Exponent of the Letter a is lefe by x than 
the Exponent of the letter c, it follows, that if each Pro- 
dud: belonging to z^'^'''^ is Multipli'd by c and Divi- 
ded by a, you will have other Produfts the Sum of 
whofe Exponents is ftill w+r; Now if all the Produdls 
belonging to 2:'^+'* '^ were Multiplied by c and Divided 
by a^ you would have fome Produfts that would be the 
fame as fome of thofe found before, therefore you muft 
except out of 'em thofe that I havecaU'd Products of the 
1'^ ClaJJis ; what I have faid (hows why all the Products 
belonging to 2^+^-3, except thofe of the i'^ and 2^ 
Claffis muft be Multipli'd by d and Divided by a : 
Laftly, you fee the Reafon why to all thefe Produ^l^s is 
added 
