Koch's Gelatinized Meat Peptone Medium

Ingredients

• 1 small piece of lean beef
• water
• 1-2 drops of muriatic acid
• 10 grams of albumen
• 5 grams of common salt
• 100 grams of pure gelatine
• common soda

Directions

1. Cover the beef with water and add 1-2 drops of muriatic acid.

2. Let it stand in a cool place for one day.

3. Squeeze the mixture through a cloth.

4. In a flask, combine the liquid with albumen, common salt, and gelatine.

5. Boil for 30 minutes until the gelatine is fully dissolved.

6. Add common soda to make the liquid slightly alkaline and boil again for 1 hour.

7. Filter the mixture.