REFRIGERANTS.
| I.— | Potassium nitrate | 2 pounds |
|---|---|---|
| Ammonium chloride | 2 pounds | |
| Water | 5 pints | |
| II.— | Potassium nitrate | 2 1/2 pounds |
| Ammonium chloride | 2 1/2 pounds | |
| Sodium sulphate | 4 pounds | |
| Water | 9 pints | |
| III.— | Ammonia nitrate | 4 pounds |
| Water | 4 pints | |
| IV.— | Sodium sulphate | 8 parts |
| Dilute hydrochloric acid | 5 parts | |
| V.— | Snow | 1 part |
| Water | 1 part | |
| Sulphuric acid | 4 parts | |
| VI.— | Snow | 3 parts |
| Calcium chloride | 4 parts |