AS PRACTISED BY THE ARABS. 89 



immediately above it. This 10 is now the upper number in the Rank of 

 the Latus. 



X. Multiply 2, the first found figure of the Root into this 10, and 

 write the product 20 in the Rank of the Square opposite to and imme- 

 diately above 40, the upper number in that Rank. 



p. Add together in the Rank of the Square this 20 and 40, and write 

 the sum 60 opposite to and immediately above them. 



v. Transfer this 60 to the right hand 4 places. This 60 so transfer- 

 red is now the upper number in the Rank of the Square. 



•£. Add 2, the first found figure of the Root to 10, the upper number 

 in the Rank of the Latus Art. x) and write the sum 12 opposite to and 

 immediately above the 10. 



ie. Transfer this 12 to the right hand 5 places. This 12 so transfer- 

 red is now the upper number in the Rank of the Latus. 



Then seek the greatest number with the following condition — 



1. That if this sought number be written in the interstice to the 

 right hand of 12, the upper number by Art. tt in the Rank of the Latus. 



2. And this sought number be multiplied into the whole figures now 

 uppermost in the Rank of the Latus, and the product written in the Rank 

 of the Square opposite 571,800, the second period of the given number, 

 which stands in the Rank of the number or Pulpit Diagram, and imme- 

 diately above 60, the upper number by Art. v in that Rank. 



