226 PHARMACEUTICAL BACTERIOLOGY. 



with linoleum. The entire room (walls, ceiling, floor) should be washed, 

 scrubbed and disinfected from time to time. That is, it should be kept 

 bacteriologically clean. 



B. Furnishings. All windows exposed to direct sunlight should have 

 white translucent roller shades. The laboratory should be well supplied 

 with gas; water, both hot and cold, if possible; and means for lighting 

 (gas, electricity, acetylene). There should be just enough furniture and 

 shelving, no more. One table with slate top or lined with linoleum; one 

 stool, shelves for samples, apparatus and reagents. A case for chemicals, 

 cotton, culture media, etc. A case, with lock and key, for samples to be 

 examined. The plumbing must be of the best and the fixtures must be of 

 safe construction. The sink should be large and deep and should be lined 

 with porcelain and supplied with an ample drain board. A hood or ventila- 

 tor should be provided to carry off steam vapors. Near the table for micro- 

 scopical work should be a shelf or case for the following works of reference: 

 U. S. Pharmacopoeia, National Formulary; National Dispensatory; Sayre's 

 Organic Materia Medica and Pharmacognosy; Culbreth's Materia Media 

 and Pharmacology; Kraemer's Botany and Pharmacognosy; Schneider's 

 Powdered Vegetable Drugs ; Winton's (Moeller's) Microscopy of Vegetable 

 Foods; Brundage's Manual of Toxicology; Holland's Urine, Common 

 Poisons and Milk; Muir and Ritchie's Manual of Bacteriology; Official 

 Methods of the American Association of Agricultural Chemists. There are 

 many other desirable reference works, but the above will serve as a nucleus 

 to which additions can be made from time to time. Only the latest edi- 

 tions should be purchased. 



C. Apparatus. There will be required: 



a. A good simple lens. 



b. Compound miscroscope. (Leitz, Zeiss or Bausch and Lomb). 

 Ocular with micrometer scale. 



Oculars, Nos. 2 and 3. 



Objectives, Nos. 3, 5, 7 and 1/12 oil immersion. 



c. Slides and covers. 



d. Section knife or razor, and strop. 



e. Polarizer, for the study of starches, crystals, etc. Should be conven- 

 ient to use. This is very important. The selenite plates which are usually 

 supplied with the polarizer are useful. 



f . Thoma-Zeiss hemacytometer with Turck ruling, for counting bacteria, 

 spores and yeast cells in vinegar, jams, jellies and other like substances. 



g. Accurately ruled metal or hard rubber millimeter ruler for measuring 

 seeds in fruit products, etc. 



h. One Arnold steam sterilizer (copper). A vegetable steam cooker 

 will serve. 



