METRIC MEASURE. +-----------------------+------------------+------------------+ | | 30 C.c. | 500 C.c. | +-----------------------+------------------+------------------+ | 1 per cent (1 : 100) | 0.30 gram | 5.00 grams | | 2 “ (1 : 50) | 0.60 “ | 10.00 “ | | 3 “ (1 : 33) | 0.90 “ | 15.00 “ | | 4 “ (1 : 25) | 1.20 grams | 20.00 “ | | 5 “ (1 : 20) | 1.50 “ | 25.00 “ | |10 “ (1 : 10) | 3.00 “ | 50.00 “ | +-----------------------+------------------+------------------+ | | 1000 C.c. | 4 liters. | +-----------------------+------------------+------------------+ | 1 per cent (1 : 100) | 10.00 grams | 40.00 grams | | 2 “ (1 : 50) | 20.00 “ | 80.00 “ | | 3 “ (1 : 33) | 30.00 “ | 120.00 “ | | 4 “ (1 : 25) | 40.00 “ | 160.00 “ | | 5 “ (1 : 20) | 50.00 “ | 200.00 “ | |10 “ (1 : 10) | 100.00 “ | 400.00 “ | +-----------------------+------------------+------------------+ SOLUTIONS. TO MAKE A 1: 500 SOLUTION. Add 1 gr. or 1 m. to 1 ounce of water. Add 15 “ 15 “ 1 pint “ Add 30 “ 30 “ 1 quart “ Add 120 “ 120 “ 1 gallon “ To make 1 : 1000 sol. take 1 part of 1.500 sol. and 1 part water. To make 1 : 2000 “ 1 “ 1.500 “ 3 parts water. To make 1 : 4000 “ 1 “ 1.500 “ 7 “ To make 1 : 5000 “ 1 “ 1.500 “ 9 “ To make a 1: 500 solution of formaldehyd add 38 minims of formalin (a 40 per cent. solution of formaldehyd) to 1 pint of water. A HANDY SOLUTION TABLE WITH DOMESTIC MEASURES. SOLUTION. DOMESTIC MEASURE. 1 : 1000 1 teaspoon to gallon. ⅒ of 1 per cent. 15 drops to quart. 1 : 500 2 teaspoons to gallon. ⅕ of 1 per cent. 30 drops to quart. 1 : 200 5 teaspoons to gallon. ½ of 1 per cent. 1¼ teaspoons to quart. 1 : 100 2½ teaspoons to quart. 1 per cent. 1¼ teaspoons to pint. 1 : 50 5 teaspoons to quart. 2 per cent. 2½ teaspoons to pint. 1 : 25 2½ tablespoons to quart. 4 per cent. 5 teaspoons to pint. 1 : 20 3 tablespoons to quart. 5 per cent. 1½ tablespoons to pint. TO PREPARE A 1: 500 SOLUTION. There are 7680 m. in 1 pint of solution (water); therefore we divide 7680 by 500 as follows: