4 I2 



Thus, to dilute a solution from twenty per cent, 

 to five per cent., add to each volume of solution 



i = 3 of the diluting fluid. 



3. Approximate Values. 



I cubic centimetre =; 17 minims. I minim = 



059 c.c. 

 100 cubic centimetres = 3 ounces, 4 drachms, 



20 minims. 

 I drachm == 3*55 c.c. 

 1000 cubic centimetres = 176 pints, i fluid 



ounce == 28*4 c.c. 



4 litres = = 7 pints. I pint = : 568 c.c. 



i gramme = iSfths grains (avoirdupois). 



I grain (avoirdupois) = "0648 gramme. 



I kilogramme = 2 pounds, 3 ounces, 119*8 



grains (avoirdupois). I drachm 177 



grammes. 



5 kilogrammes = n pounds. I oz. = 28*35 



grammes. 



I grain apothecaries' = '0648 gramme. 

 i drachm apothecaries' 5 = 3*88 grammes. 

 i ounce apothecaries' 5 == 31*1 grammes. 

 15*4 grains apothecaries' = I gramme. 



4. i millimetre == "039 (2*5) inch. I inch = 2*5 



centimetres. 

 I centimetre = "39 (!) inch. TTHTO inch = '0253 



millimetre. 

 i metre = 3*28 feet, imr inch = \ millimetre. 



TTnyu millimetre (/*) = '00004 mcn - 

 5//, = STRJO inch, f /A = TOTTOOO inch. 



5. 7T := 3'f2|.l59- 



Circumference of a circle = 2 irr = Trd. 

 Area of circle = Trr 2 . 



