504 



ILL USTRA TI T E EXPERIMENTS 



37. 



38. 



39. 



40. 



41. 



Chapter IX. 



42. 



Chapter X. 



43. 



44. 



45. 

 *46. 



*47. 



48. 



*49. 



Chapter XI. — 50. 



Protection from precipitation of hydrophobic sus- 

 pensoids by hydrophilic emulsoids. 

 (a) Colloida] iron and gelatin. 

 (6) Colloidal gold and gelatin. 



* (c) Lange's test. 

 Adsorption. 



(a) Colloid to surface. 



(b) Colloid to colloid. 



(c) Crystalloid to colloid. 



(d) Electrochemical adsorption. 

 Imbibition. 



(a) Plates of gelatin or glue and water. 

 (h) Rubber and benzene. 



* (r) Effect of the dielectric value of the imbibed fluid 



on the amount of swelling. 



(d) Pressure of imbibition. 



(i.) Laminaria. 

 *(ii.) Gelatin by cedometer. 



(e) Heat of imbibition. 



(/) Effect of electrolytes on imbibition. 

 *(7) Effect of acid on imbibition. 

 Gelation. 



(a) Reversible and irreversible. 

 {b) Effect of solutes on gelation. 



(c) Effect of non-electrolytes on gelation 



[d) Effect of electrolytes on gelation. 

 Syneresis. 



(a) Gelatin. 



(b) Starch. 



(c) Curds and whey. 



{d) Blood-clot and serum. 

 Emulsions. 



(a) Preparation of emulsions. 



(b) Optimum concentration of stabiliser. 



(c) Optimum pH of stabihsing colloid. 

 *{d) Rigidity and concentration of oil. 



(c) Breaking of emulsions. 

 Foams. 



(a) Conditions necessary for their formation. 

 (6) Breaking of foams. 

 *{c) Adsorption of enzymes by froth. 

 Enzymes. General conditions governing enzyme 



action. 

 The influence of pK on enzyme action. 

 The effect of the removal of the end products of 



enzyme action on the end point of the reaction. 

 Estimation of the relative activity of an enzyme. 

 Demonstration of the presence of a lipase in a tissue 



extract. 

 Estimation of the relative lipolytic activity of an 



extract of pancreas. 

 Preparation of semi-permeable membranes. Chemical 

 " gardens.'' 



