《NATURAL PLANT HYDROCOLLOIDS》

Introductory Remarks＆Leonard Stoloff,Seaplant Chemical Corp．,New Bedford,Mass．1

Calcium Poctinates,Their Preparation and Uses＆Clinton W．Woodmanses and George L．Baker,University of Delaware,Newark,Del．3

Factors Influencing Gelation with Pectin＆Harry S．Owens,Harold A．Swenson,and Thomas H．Schultz,Western Regional Research Laboratory,Albany 6,Calif．10

Agar Since 1943＆Horace H．Selby,American Agar＆Chemical Co．,San Diego,Calif．16

Technology of Gum Arabic＆Charles L．Mantell,457 Washington St．,New York 13,N．Y．20

Chemistry,Properties,and Application of Gum Karaye＆Arthur M．Goldstein,Stein,Hall＆Co．,Inc．,New York,N．Y．33

History,Production,end Uses of Tragacanth＆D．C．Beach,S．B．Penick＆Co．,New York,N．Y．38

Guar Gum,Locust Bean Gum,and Others＆Roy L．Whistler,Purdue University,Lafayette,Ind．45

Some Properties of Locust Bean Gum＆Hans Deuel and Hans Neukom,Swiss Federal Institute of Technology,Zurich,and Meypro,Ltd．,Weinfelden,Switzer-land51

Observations on Pectic Substances＆Hans Deuel and Jürg Solms,Swiss Federal Institute of Tech-nology,Zurich,Switzerland62

Algin in Review＆Arnold B．Steiner,and William H．MeNeely,Kelco Co．,San Diego,Calif．68

Alginates from Common British Brown Marine Algae＆W．A．P．Black and F．N．Woodward,Institute of Seaweed Research,Inveresk,Midlothian,Scotland83

Irish Moss Extractives＆Leonard Stoloff,Seaplant Chemical Corp．,New Bedford,Mass．92

Effect of Different Ions on Gel Strength of Red Seaweed Extracts＆S．M．Marshall and A．P．Orr,Marine Station,Millport,Scot-land101