xxiv INTRODUCTION. 



GEOGRAPHY. 



Instruments used in surveying. 



Instruments used in geodesy and hydrography, including hypsometrical 

 instruments, tide gauges, &c. 



Projections, maps, charts, models, and globes. 



Deep-sea sounding apparatus. Seismographical instruments. 



GEOLOGY AND MINING. 



Instruments for field and underground surveying. 



Typical collections of rock specimens, including vein stones. 



Typical fossils arranged stratigraphically. 



Maps in different stages, and finished maps. 



Geological models, horizontal and vertical sections. 



Diagrams and plates of fossils, and general geological diagrams used in 

 lecture rooms. 



Microscopic sections of rocks and minerals, and apparatus for cutting such 

 sections. 



Anemometers, water gauges, mining barometers, and thermometers. 



Mining plans, sections and models of workings. 



MINERALOGY, CRYSTALLOGRAPHY, ETC. 



Goniometers. 



Apparatus for studying and exhibiting the optical characters of crystals. 

 Sections for optical examination. 



Blowpipe and other portable apparatus for determining minerals. 

 Collections of crystals, models of crystals, plates of crystals, and apparatus 

 for drawing them. 



Educational collections of minerals, &c. 

 Diagrams and models for lecture rooms. 



BIOLOGY. 



1. Microscopes with accessory apparatus for biological research, &c. 



2. Physiological apparatus for investigating 



a. The growth and mechanical movements of living organisms and their 



parts. 



b. The chemical phenomena of living organisms. 



c. The electrical phenomena of living organisms. 



d. The functions of the nervous and other systems. 



3. Apparatus for anatomical research. 



4. Apparatus for collecting and preserving objects of natural history. 



5. Appliances for teaching biology. 



A limited number of examples illustrating the performances of the apparatus 

 will be admissible. 



