Science, Том 23John Michels (Journalist) American Association for the Advancement of Science, 1894 Since Jan. 1901 the official proceedings and most of the papers of the American Association for the Advancement of Science have been included in Science. |
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Стр. 32
... veins have been cut by this tunnel , and in these veins kaolin seams and earthy oxide of manganese are forming , so that one can see mineral veins in process of formation . Gold is found in these seemingly un- finished veins , but where ...
... veins have been cut by this tunnel , and in these veins kaolin seams and earthy oxide of manganese are forming , so that one can see mineral veins in process of formation . Gold is found in these seemingly un- finished veins , but where ...
Стр. 33
... vein stone , and , in two or three instances , as a cap to the lodes . It seems to carry little gold , as a rule . Earthy oxide of manganese ( wad ) occurs in the veins with kaolin . A quartz peculiar to the district is the granular ...
... vein stone , and , in two or three instances , as a cap to the lodes . It seems to carry little gold , as a rule . Earthy oxide of manganese ( wad ) occurs in the veins with kaolin . A quartz peculiar to the district is the granular ...
Стр. 35
... vein quartz , but the gold , for some reason , was not evenly deposited with the other min- erals , but was segregated into " shoots " or " courses " through the veins , the portions of the veins lying be- tween these " ore shoots ...
... vein quartz , but the gold , for some reason , was not evenly deposited with the other min- erals , but was segregated into " shoots " or " courses " through the veins , the portions of the veins lying be- tween these " ore shoots ...
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Meeting of the Iowa Academy of Sciences | 10 |
ROUGHING IT WITH AN ECLIPSE PARTY | 42 |
ESTERBROOKS | 56 |
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