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81 use the term "limiting current" to indicate the greatest current that under the conditions of the experiment liberates copper only.

Nitrogen Phos. (P2O5) Moisture Oils Description Per cent Per cent Per cent Per cent From Eubanks Tankard Co. Dry scrap (from 6 sacks) 8.93 6.17 6.48 5 .91 From Taft Fish Co. Dry scrap (sample from 525 tons) From Carter's Creek Fish Guano Co. Dry scrap, dried in hot air amd steam driers 8.96 7.75 6.18 39°T HE JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY Vol. 5, No. 5 third distillate at 181-20 C. of Merck's c. p. phenol, 1.56 grams being dissolved and made up to one liter.The 20 per cent KI solution was made by dissolving 200 grams of KI in 800 cc. of distilled water. The solution was not made up fresh each day as is frequently recommended. A liter of the solution required only a few drops of N/10 thiosulfate to reduce the free iodine which was formed in the solution during three weeks. THE EFFECT OF ACID CONCENTRATIONIn each of the following tables the order from left to right is the order in which the solutions were added

THE JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY 831 for anaesthetic purposes should comply with the following requirements:1. Boiling Point.-Ethyl chloride should possess a boiling point of +12.5°C .2. Odor.-On allowing 30 cc. of ethyl chloride to evaporate from a filter paper 1 21 /2 cm. in diameter, no foreign or unpleasant odor, especially a garlic odor (indicating phosphorus compounds), should be apparent either during or subsequent to evaporation.3. Residue.-When 60 cc. of ethyl chloride are allowed to evaporate in a platinum dish at room temperature. there should be left no weighable residue.4. Alcohol.When 10 cc.of ethyl chloride are agitated with 10 cc. of distilled water, both of which are at about 10o C., in a glass stoppered tube, and the supernatant layer of ethyl chloride is allowed to evaporate spontaneously from the opened tube at room temperature, and then 3 drops of potassium dichromate T. S. are added to the remaining water, followed by 5 drops of dilute sulfuric acid, and the mixture is then boiled, no odor of acetaldehyde should be apparent and no greenish or bluish color should be produced in the liquid. j. Hydrochloric Acid and Metallic Chlorides.-On dissolving 10 cc. of ethyl chloride in 10 cc. of 95 per cent alcohol U. S. P., and then adding 3 drops of silver nitrate T. S., no turbidity, even faint, should result, and no precipitate should form.A simple combination test for the purity of ethyl chloride consists in attaching a 30 cc. ethyl chloride container to a glass tube vial containing 35 cc. of water kept at 40°C . A slow stream of ethyl chloride is passed through the water until the container is emptied, and then 10 cc. of the water are tested with litmus paper, to which it should impart no acid reaction; 10 cc. with silver nitrate T. S.. as in test 5 above; and 10 cc. are finally tested for alcohol as in test 4 above.

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