MICROANALYTICAL AND BACTERIOLOGICAL LABORATORY 419 



(b) Compound microscope. 

 Ocular with micrometer scale. 

 Oculars, Nos. 2 and 3. 



Objectives, Nos. 3, 5, 7 and ^{ 2 in. 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. 



(/) Thoma-Zeiss hemacytometer with Turck ruling, for counting bacteria 

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

 Other special counting chambers. 



(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. 



(i) One hot air sterilizer. The ordinary double walled baking ovens 

 which may be secured from any hardware dealer, will serve the purpose. 

 Cut in a small opening at top for the thermometer. 



(/) One rice cooker in which to prepare culture media, etc. 



(k) One small incubator with thermo-regulator. 



(/) Centrifuge (electric). 



In addition to the above there will be required the necessary chemicals, 

 reagents, etc., good quality commercial cotton for plugging test-tubes, 

 medium size Petri dishes, flasks (J/ liter and i liter), several evaporating 

 dishes, one or two moist chambers, a quantity of medium size test-tubes, 

 slide boxes, test-tube brushes, dissecting needles, scalpels, labels, pencils, 

 etc. Get the necessary things only. There must be a liberal supply of 

 clean towels. No one but the analyst and his assistants should have 

 access to the laboratory. On entering, the analyst should remove coat 

 and hat and put on a white clean linen apron and coat, such as are worn by 

 soda fountain dispensers. This white suit should remain in the laboratory 

 and should be changed for a clea;i one as often as may be necessary. 



Special equipment and apparatus may be indicated as the work pro- 

 gresses. For instance, it may prove desirable to have an incubator for 

 opsonic work, for the use of physicians, used either by the physicians 

 or by the pharmacist. A water filtering equipment may be installed, 

 likewise a water still. An autoclave may prove desirable. There are 

 matters which must be left to the individual pharmacist. The following 

 is an outline of such work as the pharmacist may do in the microscopical 

 and bacteriological laboratory. 



