AS PRACTISED BY THE ARABS. 107 



q". And the figures of this product and that upper number be in this 

 situation added together, and the sum written opposite to and imme- 

 diately above the product. 



yf. And the sought number be multiplied into this sum, and the 

 product written in the Rank of the Biquadrate opposite to the next 

 period and immediately above the upper number in that Rank. 



4 // . And the figures of this product and that upper number be in 

 this situation added together, and the sum written opposite to and imme- 

 diately above the product. 



of. And the sought number be multiplied into this sum, and the 

 product written in the Rank of the Quadratus Cubi opposite to the next 

 period and immediately above the upper number in that Rank. 



\°. And the figures of this product and that upper number be in this 

 situation added together, and the sum written opposite to and immediately 

 above the product. 



<_. >"'. And the sought number be multiplied into this sum, then the 

 product sUall not be greater than the last Resolvend. 



c_j // . Then write the found number which answers these conditions 

 above the units of the next period, and exterior to and immediately above 

 the Pulpit Diagram. This is the next found figure of the Root. 



cj". Call the last product which answers these conditions the 



next Subtrahend, write it opposite to and immediately under the last 



Resolvend. 



e 1 



