J. BOESEKEN and H. W. HOFSTEDE: "Observations about hydration under tiie influence of i^olloïdal Catalysers and how to account for this process" 



/. //s bomb. 



2. Riiislne-flnsks. 



3. Ot- tube. 



4. H:iSOi rinstiiR-flaskK. 



5. Olass spiral to sattiralc f'lh 

 Ö. Hydronenation^apparaliis 



7. arctilalloii-tuhe for the U .- 

 N. Oas-tutretle. 



9. Mercury-flask, 

 to. Escape-tabe for the H-j. 



11. Cnp-shaped glass with i 



escape-tube empties. 



12. Motor. 



13. Thermometer in the Ihci 

 N. Electric lamp ., 



1.5. Thermo-reeulatoi . 



Fig. 2. 



I'rnaTding'i Royal Aiml. Aiiisioi dam. Vol. XX. 



