S U R 



Hence the follow ing Table \\ ill give the number of square feet in a 

 tquaie perch, iu the above-mentioned counties. 



Statute perch 13,5 X 1(5.5 272,25 square feet. 



Devonshire perch 15 X 15 225 do. 



Cornwall perch 18 X 13 = ?24 , do. 



Lane, and Yorks, perch 21 X 21 4-11 do. 



Cheshire and Staff, perch 24 X 24 = 576 do. 



Il'Mesfor reducing Statute Measure to Customary ', and the contra ty. 



}. To reduce statute measure to customary, multiply the number 

 of perches statute measure, by the square feet in a square perch statute 

 measure ; divide the product by the square feet in a square perch cus- 

 tomary measure, and the quotient will be the answer in square perches ; 

 which reduce to roods and acres, by dividing by 40 and 4. 



2. To reduce customary measure to statute, multiply the number of 

 perches, customary measure, by the square feet in a square perch custo- 

 mary measure ; divide the product by the square feet in a square perch 

 statute measure, and the quotient will be ths answer in square perches; 

 which red ace as before. 



By these rules tables may be calculated to save the trouble of com- 

 puting for particular cases ; thus, 



TABLE I. 

 To reduce Statute Measure to Customary of 21 feel to a perch. 



sec 



