Journal of Applied Microscopy. 



163 



demonstration apparatus for actual 

 students' work. All of the appointments 

 of this laboratory are methodically cor- 

 rect, and while space prevents a detailed 

 description of them, we cannot refrain 

 from giving one particularly practical 

 feature which might profitably be intro- 

 duced into other lines of work, viz., each 

 set of apparatus is mounted upon a lable 

 and is accompanied by a fixed diagram 

 of that apparatus, which is constantly 

 before the student. This diagram shows 

 the location of every piece and by means 

 of a color scheme the wiring for electrical 

 apparatus. The names of all parts are 



one color, while the wires furnishing the 

 induction coils are given a different color, 

 and so on. In addition to the twelve 

 work tables of special apparatus, three 

 sides of the room are provided with work 

 tables attached to the walls, and 

 supplied with apparatus stands, reagent 

 cases, etc., with wall lockers for the 

 students' private material. On these side 

 tables the dissections are made, also gen- 

 eral preparations, some of which are 

 afterwards used for experimental pur- 

 poses with the measuring and recording 

 apparatus. Professor Gaylord P. Clark, 

 who has charge of this laboratory, has 



A Corner in the Library, Medicul Department, i^yracUbe University. 



plainly indicated on the diagram, and it 

 is therefore possible for the lecturer to 

 direct a series of experiments, even with 

 beginning students, with the assurance 

 that his explanations of the apparatus to 

 be used and directions for performing the 

 experiments will be understood. As the 

 most of the apparatus in the physiologi- 

 cal laboratory is actuated by electricity, 

 requiring several systems of wires, the 

 same color scheme which is used in the 

 diagram is applied to the wires; for 

 example, each of the twelve recording 

 drums is provided with a marker, and 

 the twelve markers are actuated by a 

 single pendulum, which can be adjusted 

 to mark two seconds, one second, etc. 

 The wires from this pendulum are given 



devised a number of very ingenious 

 pieces of apparatus for his work, among 

 these a ''epresentation of the mammalian 

 circulatory system, showing the general 

 distribution of arteries, veins, capillaries, 

 etc., and having a mechanical device for 

 demonstrating the effect of the contrac- 

 tion of the heart, and of respiration, etc., 

 upon the blood pressure, these various 

 changes being recorded by a sphygmo- 

 graph, just as though the experiment 

 were being performed upon a living ani- 

 mal. Another apparatus is designed to 

 demonstrate the course of the principal 

 nerve tracts in the cord and in the brain, 

 the tracts being indicated by colored 

 threads, which are held in place at inter- 

 vals by wooden sections, which are 



