Journal of Applied Microscopy. 



31 



burner table, card and object cabinet 

 are the same as described. One table is, 

 however, provided with a plate glass 

 top, one-half of which is underlaid with 

 black and the other with white paper for 

 dissection work. A high and low-power 

 Briicke type lens and a variety of lens- 

 holders complete the equipment. The 

 professor's large roll-top desk and 

 revolving book-case are placed conven- 

 iently to the book-shelves containing his 

 books, pamphlets, and reports. The 

 lockers contain the unmounted micro- 

 scopical material for class use together 

 with all the other material involved in 

 personal investigation. Here again the 

 card cabinet intervenes to bring order 

 out of what would otherwise soon 

 become, if indeed it could ever be other- 

 wise than, chaos. The material is of 

 course mostly in bottles, and these are 

 kept in any of the forms of reagent 

 boards shown in figure 2. Each locker is 

 numbered and each board in the locker 

 also. The transverse rows of holes in 

 the boards are also numbered, beginning 

 in front. It is thus possible to designate 

 on the cards in the card cabinet the 

 exact location of any object. The rule 

 is then simply to record on its particular 

 card the location of every addition to 

 the collection and to adhere to the prac- 

 tice of always putting the material back 

 in its place. The simplicity and accu- 

 racy of the system may be best illus- 

 trated by an example. -Suppose one is to 

 find among the several hundred bottles 

 of specimens one containing isolated 

 ciliated epithelium from the horse. It is 

 only necessary to refer by the guide 

 cards to " Epithelium," then under "C" 

 ciliated epithelium, and the record 

 appears, with a reference for example, 

 " 16, 4, 8|3," meaning that the desired 

 bottle is in locker 16, tray 4, the eighth 

 row of holes and the third hole in the 

 row. Compare such a system with the 

 quite common one of literally " paw- 

 ing " through a mass of unclassified or 

 partly classified "debris" until the 

 desired article, perchance, comes to 

 light! To return the bottle to its proper 

 place it is only necessary to consult the 

 record on the label. As the collection 

 grows it classifies itself, new specimens 

 being recorded on cards already contain- 

 ing the record of similar material or 

 adjacent to it, and being assigned 

 adjacent positions in the trays. 



The card cabinet is also used for 

 bibliographical purposes and for record- 

 ing the results of observations and all 

 kinds of information. 



The Bacteriological and Pathological 

 Laboratories. — These occupy the west 

 half of the upper fioor and are the same 

 in general arrangement and equipment 

 as the laboratories just described, the 



tables, stools, Icckei's and reagent boards 

 being the same, with the exception of a 

 special board which is arranged with 

 wooden pegs as shown in the figure, so 

 that test tubes, bottles, etc., can be 

 placed upon it to dry and kept inverted, 

 preventing dust from falling into them. 

 The windows in the general laboratory 

 are, however, arranged at equal dis- 

 tances from each other and there are 

 tables for ten students only, as a greater 

 number could not conveniently work at 

 one time and do all their own work at 

 the sterilizers, etc. The special features 

 of the general bacteriological laboratory 

 are the incubator room with its three 



RACK rOR DRYING D0TTLE5. 



large incubators for pathogenic and 

 special cultures. (All connections 

 between the incubators, sterilizers, and 

 burners, and the gas supply are made 

 by means of small lead pipes. This pipe 

 offers the advantage over rubber hose 

 that it does not rot out and does not 

 permit the escape of gas into the air. 

 In case of a burner lighting back, the 

 lead pipe will not burn as rubber would. 

 The connection between the lead pipe 

 and the gas pipe or burner is made by 

 means of rubber tubing, and where burn- 

 ers are to be moved about the rubber 

 tube can be a foot or so long.) The 

 student's everyday cultures are kept at 

 the proper temperature in a gigantic in- 

 cubator which stands in the work room 

 (I, at the left end of lab. in plan). Each 

 section has its own shelf in the incubator 

 and each student's cultures, be they few 

 or many, are kept in an easily steriliz- 

 able tin receptacle specially provided 

 for that purpose. Each work-table has 

 a Bunsen burner with by-pass so that 

 the flame may be shut off with the 

 exception of a small side-flame, which 

 ignites the main flame by simply turn- 

 ing the valve open. There are several 

 large hot-air sterilizers all grouped 

 under the hood (see plan). The steam 

 sterilizers (ST) are of special construc- 

 tion and of ample size for the accommo- 

 dation of the sterilizing receptacles of 

 an entire section. 



The nivellating table (NT) is designed 

 to take the place of the usual forms of 

 nivellating apparatus, as it is itself per- 

 fectly level, is provided with several 

 shelves divided into compartments, the 

 whole being- covered with a glass hood, 

 excluding dust but not light. The area 



