AS PRACTISED BY THE ARABS. HI 



d. Add together in the Rank of the Cube 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 Cube. 



o. Multiply the last figure of the Root into this sum, and write the 

 product in the Rank of the Biquadrate opposite to and immediately 

 above the upper number in that Rank. 



j. Add together in the Rank of the Biquadrate 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 Biquadrate. 



j. Multiply the last figure of the Root into this sum, and write the 

 product in the Rank of the Quadratus Cubi opposite to and immediately 

 above the upper number in that Rank. 



(j». Add together in the Rank of the Quadratus Cubi 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 

 Quadratus Cubi. 



And these operations are analogous to those from k" to t" . 



{ J i . Add the last 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. 



jd. Multiply the last 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 1 



