PAirr 11 



ILLUSTRATIVE EXPERIMENTS 



•• Science has but one language, that of quantity, and but one argument, that of 

 experiment." Starling. 



■• The laboratory is the fore-court of the temple of philosophy ; and whoso has 

 not offered sacriliees and undergone purification there, has little chance of admission 

 into the sanctuary." Huxley. 



List of Experiments 



are suitable for demonstration 



or for more advanced 



Chapter VI. — 



6. 



7. 



8. 



9. 

 10. 

 11. 

 12. 

 1.3. 

 14. 

 15. 

 16. 

 17. 



18. 



*19. 



20. 



Chapter 



*21. 

 VII.— 22. 



Bomb calorimeter. 

 Diffusion. Gaseous. 

 Diffusion. Liquid. 



Partial separation of two solutions by diffusion. 

 Osmotic pressure of crystalloids, 

 (a) By osmometer. 



*(6) By determination of the depression of the 

 freezing-point. 



*(c) By Barger's method. 

 Turgor. 

 Soap films. 



Camel's hair brusfi experiment. 

 Cohesion — a surface tension phenomenon. 

 Work done by altering surface tension. 

 Effect of soap formation on surface tension. 

 Camphor, ' ' Water-beetle ' ' 

 Camphor-benzene " amoeba." 

 Mercury " amoeba." 

 Electrical alteration of surface tension. 

 Oshvald's " Physical heart." 

 Measurement of surface tension. 



(1) Stalagmometer method. 



(2) Capillary rise method. 

 Adsorption to a surface. 



(1) Charcoal and crystalloids. 



(2) Hay's test for bile salts. 

 *(3) Flotation. 



Demonstration of the oxidation of oxalic acid when 



adsorbed to charcoal. 

 Effect of capillary active substances on the rate of 



sedimentation of suspensions. 

 Capillary electrometer. 

 Strength of acids. 



(a) By taste. 



(b) By hydrolysing power. 



502 



