UNITS IN COMMON USE IN LABORATORIES 



Cubic Meter. Unit of space for the number of organisms in air. It 

 contains 1000 liters. It is equal to 1.308 cubic yards or 35.316 

 cubic feet. One thousand cubic feet, the unit of space in disinfec- 

 tion, is equal to 28.3+ cubic meters. One cubic decimeter is one 

 liter and equals 0.908 quarts dry measure or 1.0567 quarts liquid 

 measure. 



Liter. Unit of space for normal volumetric solutions. It contains 

 1000 cubic centimeters. It is equal to 1.0567 quarts or 33.84- 

 ounces. A liter of distilled water weighs i kilogram. One U. S. 

 gallon is equal to 3785 c.c. and one imperial gallon to 4543 c.c. 

 One fluid ounce equals 29.57 c.c. 



Cubic Centimeter. Unit of space for organisms in water, milk, vac- 

 cines, etc., i c.c. = 0.27 fl. dr. There are, approximately, 20 drops 

 in i c.c. of water, provided the capillary pipette has a bore of about 

 i mm. and is held horizontally. A finely drawn capillary pipette, 

 held vertically, will deliver about 50 drops from i c.c. 



Cubic Millimeter. Unit of space for blood-cells. There are 1000 

 cubic millimeters in i cubic centimeter and i million cubic milli- 

 meters in i liter. In water analysis, as there are i million milli- 

 grams in one liter, parts in the million and milligrams per liter 

 are the same. 



i Meter = 39. 3 7 inches. 



i Centimeter = 0.393 7 inch. Approximately, 2/5 inch. 



i Millimeter = 0.0393 i nc h. Approximately, 1/25 inch. 



i Inch = 2 5. 4 mm. 



i Yard = 0.9 144 m. 



i Kilogram = 2. 2+ pounds av. 



i Centigram = 0.154 grain. 



i Milligram = 0.01 54 grain. Approximately, 1/64 grain. 



A pound avoirdupois is equal to 453.59 gm. 



i Oz. avoirdupois is equal to 28.35 gm. 



One hundred cubic centimeters of a saturated solution contains: 



Water Alcohol 



Methylene blue, 6.68 0.66 gram. 



Gentian violet, 1.75 4.42 grams. 



Basic fuchsin, 0.66 2.92 grams. 



Key to Table on opposite page. 



= negative + = positive, O = no change, A = acid, Alk. = alkaline, G 6 , 

 Fl = fluorescence, Pep = peptonization, i= litmus Russell's medium not reduced; 

 2 = reduced, 3 = action variable. Proteus gives a peculiar dark, heavy oil-li 1 

 fluorescence in neutral red glucose bouillon. 





