 I have watched pairs of sparrows repeatedly feeding their young, and have found that they bring food to the nest once in ten minutes during at least six hours of the twenty-four, and that each time from two to six caterpillars are brought : every naturalist...  A history of British birds - Seite 271von Francis Orpen Morris - 1852Vollansicht - Über dieses Buch
 | 1860 - 604 Seiten
...naturalist will know this to be under the mark. Now, suppose that the 3,500 sparrows destroyed by an association for killing sparrows were to have been alive the next spring, each pair to have bnilt a nest, and reared successive broods of young during three months, we have, at the rate of 252,000... | |
 | Henry Gardiner Adams - 1854 - 110 Seiten
...each time from two to six caterpillars are brought. Now, suppose that the 'three thou70 SPARROW. sand five hundred Sparrows' destroyed by 'the Association...three months, we have, at the rate of two hundred and fifty thousand per day, the enormous multitude of twenty-one millions and sixty-eight thousand larvae... | |
 | Henry Gardiner Adams - 1855 - 110 Seiten
...of the twenty-four, and that each time from two to six caterpillars are brought. Now, suppose that the 'three thousand five hundred Sparrows' destroyed...three months, we have, at the rate of two hundred and fifty thousand per day, the enormous multitude of twenty- one millions and sixty- eight thousand larvae... | |
 | John Timbs - 1858 - 274 Seiten
...experienced. Mr. John Hawley of Doncaster, in the Zoologist, thus states the case : " I have watched pairs of sparrows repeatedly feeding their young,...twenty-one millions one hundred and sixty-eight thousand larvae prevented from destroying the products of the land, and from increasing their numbers from fifty... | |
 | John Timbs - 1858 - 296 Seiten
...their young, and have found that they bring food to the nest once in ten minutes during at least she hours of the twenty-four, and that each time from...fifty-two thousand per day, the enormous multitude of twenty- one millions one hundred and sixty-eight thousand larvae prevented from destroying the products... | |
 | 1863 - 606 Seiten
...naturalist will know this to be under the mark. Now, suppose that the 3,'>00 sparrows destroyed by an association for killing sparrows were to have been...reared successive broods of young during three months, wo have, at the rate of 263,000 per day, the enormous multitude of 21,108,000 larvie prevented from... | |
 | John Timbs - 1869 - 280 Seiten
...three thousand five hundred sparrows' destroyed by the ' Association for killing Sparrows' were to havo been alive the next spring, each pair to have built...we have, at the rate of two hundred and fifty-two theusand per day, the enormous multitude of twenty-one millions one hundred and sixty-eight thousand... | |
 | ROGERSON AND TUXFORD - 1863 - 606 Seiten
...naturalist will know this to be under the mark. Now, suppose that the 8,000 sparrows destroyed by an association for killing sparrows were to have been...young during three months, we have, at the rate of 352,000 per day, the enormous multitude of 21,168,000 larvie prevented from destroying the products... | |
 | 1863 - 682 Seiten
...Every naturalist will know this to be under the mark. Now, suppose the 3,500 sparrows destroyed tythe ' Association for Killing Sparrows ' were to have been...young during three months, we have, at the rate of 252,000 per day, the enormous multitude of 21,168,000 larvae prevented from destroying the products... | |
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