CONTENTS VII 



Tables 45-7-1. Analyses of water — Continued Page 



59. From East African lakes G33 



60. From Northern Rhodesia and adjacent Tanganyika 33 



61 . From Somalia 33 



62. From Moza mbique 34 



63. From Angola 34 



64. From the Congo River basin 34 



65. From Nigeria 35 



66. From Colony, Ghana 35 



67. From Ashanti, Ghana 35 



68. From Northern Territories, Ghana 35 



69. From French West Africa 36 



70. From Algeria 36 



71 . From Venezuela 36 



72. Miscellaneous South American waters 37 



73. From the Amazon River and its tributaries 37 



74. From rivers in the southern part of South America 37 



75-SO. Discharge and chemical denudation: 



75. Of North America 38 



76. Of Europe 39 



77. Of Asia 39 



78. Of Africa ." 39 



79. Of Australia 40 



80. Of South America 40 



81. Mean composition of river waters of the world 41 



82. Bromine and iodine content of river and lake waters 42 



83. Boron content of lakes and rivers 43 



84. Lithium content of lake and river waters 43 



85. Strontium content of lakes and rivers 44 



S6. Radium content of lakes and rivers 45 



87. Arsenic content of lake and river waters 45 



88. Argon content of lake water 46 



89. Copper content of lakes and rivers 47 



90. Cobalt and nickel content of lakes and rivers 48 



91. Uranium content of lakes and rivers 51 



92. Some singly occurring natural radioisotopes of elements that are chemically detectable in lakes and rivers.. 51 



93. Proximate composition of dissolved organic matter from Wisconsin lake waters containing varying amounts 



of total organic carbon 52 



