 In reviewing the results of these investigations and comparing one species with another, without losing sight of the fact that comparative good is not necessarily positive good, it appears that of 7 species considered the Downy Woodpecker is the most...  The American Naturalist - Página 9401896Vista completa - Acerca de este libro
 | 1893 - 408 páginas
...of their stomachs from many localities would show only a small percentage of this particular food. In reviewing the results of these investigations and...number of insects it eats and in part to the nature of its vegetable food, which is of little value to man. Three-fourths of its food consists of insects,... | |
 | Foster Ellenborough Lascelles Beal, Frederic Augustus Lucas - 1895 - 44 páginas
...of their stomachs from many localities would show only a small percentage of this particular food. In reviewing the results of these investigations and...number of insects it eats and in part to the nature of its vegetable food, which is of little value to man. Three-fourths of its food consists of insects,... | |
 | 1895 - 656 páginas
...of their stomachs from many localities would show only a small percentage of this particular food. In reviewing the results of these investigations and...number of insects it eats and in part to the nature of its vegetable food, which is of little value to man. Three-fourths of its food consists of insects,... | |
 | 1896 - 1172 páginas
...The paper is based on the examinations of 679 stomachs of Woodpeckers, representing 7 species—all from the eastern United States. The results of the...number of insects it eats, and in part to the nature of its vegetable food, which is of little value to man. Three-fourths of its food consists of insects,... | |
 | Nebraska State Horticultural Society - 1896 - 312 páginas
...Agriculture, in summing up the results obtained from the examination of 679 stomachs of these birds, writes as follows:* "In reviewing the results of these investigations...not necessarily positive good, it appears that of seven species considered the Downy Woodpecker is the most beneficial." He the» goes on -to give the... | |
 | Oliver Davie - 1900 - 568 páginas
...of their stomachs from many localities would show only a small percentage of this particular food. In reviewing the results of these investigations and...number of insects it eats and in part to the nature of its vegetable food, which is of little value to man. Three-fourths of its food consists of insects,... | |
 | Oliver Davie - 1900 - 568 páginas
...of their stomachs from many localities would show only a small percentage of this particular food. In reviewing the results of these investigations and...number of insects it eats and in part to the nature of its vegetable food, which is of little value to man. Three-fourths of its food consists of insects,... | |
 | Indian Museum - 1900 - 366 páginas
...of their stomachs from many localities would show only a small percentage of this particular food. In reviewing the results of these investigations and...not necessarily positive good, it appears that of seven species considered, the Downy Woodpecker is the most beneficial. This is due in part to the great... | |
 | Nebraska. State Board of Agriculture - 1901 - 310 páginas
...Agriculture, in summing up the results obtained from the examination of 679 stomachs of these birds, writes as follows:* "In reviewing the results of these investigations...not necessarily positive good, it appears that of seven species considered the Downy Woodpecker is the most beneficial." He then goes on to give the... | |
 | Lawrence Bruner - 1896 - 132 páginas
...Agriculture, in summing up the results obtained from the examination of 679 stomachs of these birds, writes as follows :* "In reviewing the results of these investigations and comparing one *See Bull. No. 7, Div. Ornith. & Mamolog., p. 9. species with another, without losing sight of the... | |
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