3. Weight. The unit is the gram. This is approximately the weight of 1 cc. of pure water at its temperature of greatest density (4°). It is equal to 15.43 grains. 10 milligrams (mg.) = 1 centigram (cg.) 1 10 centigrams = 1 decigram (dg.) 10 decigrams = 1 gram (g.) 1000 grams 1 kilogram (kg.) = The gram and kilogram are the units of weight most generally used by the chemist. Thus, the weight of a crucible is given as (say) 10.532 g. and not 10,532 mg. or 10 g. 5 dg. 3 cg. 2 mg. W, soluble in water. W W W W AWWAAA WA WWWWWWWWW W WW WWA W WAWW WAAAI W WWAWWWAAAIW W WAWWXWWWXAAXX A, insoluble in water, soluble in either HCl or HNO, or in both. I, insoluble in water and in acids. X, slightly soluble in water and slightly or readily soluble in acids. TREATMENT OF CUTS AND WOUNDS Every laboratory should be supplied with the materials necessary for the treatment of cuts and burns. Such wounds when immediately and intelligently treated give little or no trouble, but if left to take care of themselves infection may occur and serious results follow. In case of severe wounds, the student, after the preliminary treatment in the laboratory, should be sent to a physician. The following materials required for the treatment of wounds should be kept in the laboratory in a tight cabinet or cupboard: 1. Plain, sterile gauze bandage: 6 rolls, 1 inch by 10 yards; 6 rolls, 2 inches by 10 yards. 2. Adhesive plaster for holding gauze in place: 2 rolls, 0.5 inch by 10 yards. 3. 1000 cc. of benzine (low-boiling gasoline). 4. 2000 cc. of Seiler's solution (this may be made from tablets purchased at any drug store). 5. Boric acid solution prepared by dissolving 20 g. of boric acid in 1000 cc. of water. 6. Iodine solution — ordinary tincture of iodine; may be purchased at any drug store. 7. 100 cc. of Agnew's solution prepared after the following prescription: Tannic acid Borax Glycerine . Camphorated water 10 grains 10 grains 1 drachm q. s. to make 1 ounce Different wounds should be treated as follows: a. Cuts from glass. Remove any dirt or grease from the wound and surrounding skin by washing with gauze saturated with benzine. A rather free bleeding at first will help to prevent infection. Finally wash the wound with a piece of gauze saturated with the iodine solution; then bandage so as to prevent contamination. b. Burns. Apply gauze saturated with Seiler's solution and then bandage. c. Burns from acids. Treat the same as ordinary burns, as directed under b. d. Burns from alkalies. Wash with boric acid solution on gauze and then bandage. e. Acid in eyes. Wash the eyes with a large volume of water, then with a solution of boric acid. Finally add a few drops of Agnew's solution and apply to the eyes a small gauze pad which is kept saturated with ice water. INFORMATION REGARDING APPARATUS AND The lists following include the apparatus and chemicals required for the experiments in this notebook. It is always best to furnish each student with as complete an outfit as possible and to hold him responsible for the same. Certain pieces may, however, be used in common by a number of students, and these have been placed in a separate list. It is always cheapest to purchase the apparatus and chemicals in as large quantities as possible. The amounts of most of the chemicals needed for a class of ten are so small that the cost of the same will be proportionately much greater than when larger quantities are ordered. It is always best to order the definite amounts of chemicals listed in the catalogues, such as 100 g. or 1 lb.; otherwise the cost of weighing out odd quantities and preparing these for shipment may amount to more than the cost of the chemicals. The supplies may be obtained from any of the large dealers. Catalogues will be sent on application and should be in every school. The following are the addresses of some of the largest firms: Central Scientific Company, 412 Orleans St., Chicago, Ill. Chicago Apparatus Co., 32 Clinton St., Chicago, Ill. Kauffman-Lattimer Co., Columbus, Ohio. L. E. Knott Apparatus Co., Boston, Mass. Eimer and Amend, 205 Third Avenue, New York City. E. H. Sargent & Co., 145 Lake St., Chicago, Ill. A list of the supplies needed should be sent to a number of firms for quotations on prices. In ordering any piece of apparatus a certain form in some catalogue should be designated; otherwise it will be impossible to compare the prices. In general it is best to purchase as simple a form of apparatus as possible; for example, 20 cents will buy a Bunsen burner which for ordinary purposes is preferable to those costing $1. A much higher price will have to be paid for small orders placed for immediate delivery. A person experienced in the purchase of supplies will always find it possible to reduce materially the cost of the order. APPARATUS REQUIRED FOR EACH STUDENT (TO BE KEPT IN STUDENT'S LOCKER) Beakers, nest of 7 (100-cc. to 700-cc.). Blowpipe, mouth. Bottle, narrow-necked, 1000-cc. (Fig. 25, B). Bottles, wide-mouthed: 1 (60-cc.) (Fig. 38, 4); 5 (250-cc.) (Fig. 20). Burner, wing-top, for bending glass tubing (Fig. 4). Calcium chloride drying-tube, straight, 15 cm. in length (Fig. 23, B). Charcoal, 1 piece 8 cm. x 3 cm. Deflagrating-spoon. Dish, lead, diameter about 6 cm., depth 3 cm. Evaporating-dish, diameter 7 cm. File, round, about 15 cm. in length. File, triangular, about 15 cm. in length. Filters, 25, diameter about 11 cm. Flasks 2 (250-cc.); 1 (500-cc.). Funnel, diameter about 6.5 cm. Funnel tube, external diameter of tube 6 mm. Glass rod, diameter 3 mm., 1 piece 15 cm. in length. Glass rod, 1 piece 10 cm. in length. Glass tubing, 200 g., soft, external diameter 6 mm., walls 1 mm. thick. Pipe-stem triangle, for holding porcelain crucible (Fig. 16). |