8. Other experiments in which poisonous gases are prepared, such as chlorine, bromine, or phosphine, should be performed by the teacher.

9. Unless the class is so small that the teacher can personally direct each student, the experiment on the preparation

of hydrogen by any method should be performed by the teacher.

10. All experiments involving reductions by means of hydrogen or the burning of hydrogen should be performed by the teacher.

11. Keep your first-aid closet well stocked.

12. Carry all acid bottles with both hands, one on the bottom, one holding the neck. Carry one bottle at a time.

LABORATORY FIRST AID

1. Accidents, if serious, should be reported to the instructor. 2. Cuts. Wash in running water, then with a piece of absorbent cotton saturated with iodine solution. Bandage to prevent contamination.

3. Burns caused by hot objects. Cover with a paste made by mixing sodium bicarbonate and carron oil (equal parts of olive oil and lime-water). Then cover with cotton and bandage.

4. Burns caused by acids. Wash with water, apply a solution of sodium bicarbonate, then treat as in 2.

5. Burns caused by alkalies. Wash with boric acid, then treat as in 2. Wash with water, then dilute solution of sodium bicarbonate, then olive oil. Do not rub.

6. Acids in eyes.

7. Bases in eyes.

Wash with water, then boric acid solution, then oil. Do not rub.

8. Other substances in eyes. Use water, boric acid, then oil. Do not rub.

9. If a chemical is swallowed call a physician. Meanwhile, give emetic of mustard and warm water. Consult "First Aid" for antidote.

10. If irritating gases are inhaled breathe fresh air. In case of hydrogen chloride, sulphur dioxide, chlorine, or bromine, a very dilute solution of ammonium hydroxide sniffed into the nose often brings relief. If the gases are in the eyes, bathe with water and boric acid. If overcome by hydrogen sulfide, inhale chlorine gas (prepared quickly by treating powdered potassium chlorate in a beaker with a few drops of hydrochloric acid at a time).

HOUSEHOLD CHEMISTRY

PART I

FIRST TERM'S WORK

I. PRELIMINARY EXPERIMENTS

UPON entering the laboratory, hang your coat upon the hooks provided, roll back your sleeves, put on your apron, and check your apparatus with the following list. If anything is missing or not in good condition, report to the instructor. After the first day, broken or lost apparatus will be charged to your

Apron, cloths, sponge, soap, sapolio, paper.

After checking your apparatus, fold and put away your apron and lock the drawer and locker. Keep your key.

APPARATUS.

EXPERIMENT 1

The Bunsen Burner

Bunsen burner, matches, beaker, test tube, test tube holder, wire screen.

Note to student: When you enter the laboratory, put on your apron and begin the experiment at once. Work independently unless otherwise instructed. Do not waste time. Unfinished experiments will have to be finished after school. Put your name, the date, the number of the experiment at the top of a page in your notebook and record carefully each observation as you work. Be sure to have the instructor sign your notes before you leave the laboratory. Always bring your laboratory notebook with you on recitation days in order that the experiment just performed may be discussed.

Note to teacher: Much time will be saved if the parts of the Bunsen burner are briefly explained before the students enter the laboratory. Also show how to heat a liquid in a test tube and how to use a ring stand.