ILLUSTRATIONS 



Figure 1. Combustion tube for the determination of total nitrogen 9 



Figure 2. Parr's apparatus for the determination of carbon dioxid 18 



Figure 3. Modified Marr apparatus for determining carbon dioxid 19 



Figure 4. Metal extractor used for extracting tanning materials 56 



Figure 5. Apparatus for distillation of arsenic chlorid 64 



Figure 6. Apparatus for detection of formic acid 153 



Figure 7. Apparatus for the determination of arsenic 172 



Figure 8. Apparatus for the determination of volatile acids 239 



Figure 9. Apparatus for the Folin ammonia determination 275 



Figure 10. Van Slyke apparatus for the determination of amino nitrogen 282 



Figure 11. Details of the deaminizing bulb and connection 283 



Figure 12. Apparatus for the melting point determination 303 



Figure 13. Apparatus for the determination of the Polenske number 309 



Figure 14. Knorr's apparatus for the determination of carbon dioxid 339 



Figure 15. Heidenhain's apparatus for the determination of carbon dioxid 341 



