AS PRACTISED BY THE ARABS. 105 



i% Multiply the last found figure of the Root into this sum and 

 write the product in the Rank of the Square opposite to and immediately 

 above the upper number in that Rank. 



f. Add together in the Rank of the Square this product and that 

 upper number, and write the sum opposite to and immediately above them. 

 This sum is now the upper number in the Rank of the Square. 



vf . Multiply the last found figure of the Root into this sum and write 

 the product in the Rank of the Cube opposite to and immediately above 

 the upper number in that Rank. 



/f . Add together in the Rank of the Cube this product and that 

 upper number, and write the sum opposite to and immediately above them. 



/'. Transfer this last sum to the right hand three places. This sum 

 so transferred is now the upper number in the Rank of the Cube. 



if. Add the last found figure of the Root to the upper number in the 

 Rank of the Latus, and write the sum opposite to and immediately above 

 it. This sum is now the upper number in the Rank of the Latus. 



X? '. Multiply the last found figure of the Root into this sum, and 

 write the product in the Rank of the Square opposite to and immediately 

 above the upper number in that Rank. 



fjif. Add together in the Rank of the Square this product and 

 that upper number, and write the sum opposite to and immediately 

 above them. 



