APPARATUS AND MATERIALS. 35 



Cross-section paper; that ruled every 2 mm., with cm. lines heavier 

 is best. 



Black paper in large sheets for dark hoods etc. An ideal paper for 

 this would be black for the inside and white, to reflect heat, on the out- 

 side. Particularly good for hoods, etc., is a roll of the felt paper, 3 feet 

 wide, used as drying paper in herbaria. 



Roll of cheese-cloth. 



Filter-paper. 



Glue, mucilage, gummed labels, pins (very long and slender), tacks, 

 rubber bands, brass paper-fasteners. 



Strongest linen thread, "carpet thread " (or No. 20 or 30) ; twine. 



Fine silk thread. 



Dentist's rubber sheeting, medium thickness (can be dispensed with; 

 see page 79). 



General glassware. 



Parchment paper and tubing (smallest size). 



Higgins' waterproof India ink. 



Bottle of chronographic ink. 



Black sealing-wax, soft. 



Blue-print paper (obtained fresh from time to time) and printing- 

 frames. 



Tracing-linen. 



Beeswax, hard paraffine, and vaseline. 



Strips of soft flexible brass (such as " paper-fasteners " are made from). 



Small can of good varnish ; pot of dull black paint. Brushes should 

 be kept in stoppered bottles. 



Panes of good thin white glass of various sizes. 



Plaster of Paris. 



B. CHEMICALS USED IN COMMON BY ALL OF THE 



STUDENTS. 



(Approximate amount used by twelve students in one year.) 



Mercury, 15 kilos, (usable year after Iodine solid, 25 g. 



year). Olive oil, 2 small bottles. 



Pyrogallic acid, 100 g. Safranin, small bottle. 



Caustic potash, i kilo. Soda lime, - kilo. 



Alcohol, 5 liters. Phosphorus, 100 g. 



Potassium ferrocyanide, 100 g. Sugar, granulated, I kilo. 



Copper chloride, 50 g. The aniline dye, " scarlet," 25 g. 



Molasses, i liter. Calcic oxide for lime-\vater. 



Coarse salt, 2 kilos. Formaline, 200 cc. 



Potassium iodide. 25 g. Hydrochloric acid, 200 cc. 



