AS PRACTISED BY THE ARABS. 83 



(40). When a number is said to be transferred any number of places 

 to the right hand, it is hereby meant that a copy of this number should 

 be made immediately above itself with this condition, that counting from 

 the units of the number said to be transferred as many interstices to the 

 right hand as the number of places which it is said to be transferred, the 

 units of the transferred number are to be written in the last or most right 

 hand of these interstices, and the tens of the transferred number are to be 

 written in the interstice immediately to the left hand of that last, and the 

 hundreds in the interstice next to the left of the tens, and the thousands 

 in the interstice next to that, and so on through all the degrees, so that 

 each degree of the number in question should be copied as many interstices 

 to the right hand, as the number of places which it is said to be transferred. 



Thus in the Rank of the Quadratus Cubi at the letters t and u, the num- 

 ber 192 is transferred one place to the right hand, for the unit 2 is copied 

 above it one interstice to the right hand of the original 2, the tens 9 is 

 copied one interstice to the right hand of the original 9, and so of 1. 



And in the Rank of the Biquadrate at the letter f3' and y' the number 

 4,197,615 is transferred 2 places to the right hand, for the unit 5 is copied 

 above it two interstices to the right hand of the original 5, the tens 1 is 

 copied two interstices to the right hand of the original 1, the hundreds 

 6 is copied two interstices to the right of the original 6, and so of 7, 9, 

 1, and 4. 



And in the Rank of the Cube at the letter &' and /' the number 

 256,258,080 is for similar reasons said to be transferred 3 places to the 

 right hand, and so in the Rank of the Square at the letter p" and v" 

 821,340 is transferred 4 places, and in the Rank of the Latus at the 

 letter tt iv and f 140,736 is transferred 5 places to the right hand. 



Y 



