 Insects and birds have been carefully classified according to their several species; their habits of feeding have been closely observed, and the results ascertained and computed. It has been concluded that by no agency save that of little birds can the...  Report - Página 308por New Hampshire. Department of Agriculture - 1873Vista completa - Acerca de este libro
 | 1862 - 448 páginas
...closely observed, and the results ascertained and computed. It has been concluded that by no agency save that of little birds can the ravages of insects be kept down. There are some birds which live exclusively upon insects and grubs, and the quantity which they destroy... | |
 | 1862 - 446 páginas
...closely observed, and the results ascertained and computed. It has been concluded that by no agency save that of little birds can the ravages of insects be kept down. There are some birds which live exclusively upon insects and grubs, and the quantity which they destroy... | |
 | United States. Congress. Senate - 1862 - 1092 páginas
...closely observed, and the results ascertained and computed. It has been concluded that by no agency save that of little birds can the ravages of insects be kept down. There are some birds which live exclusively upon insects and grubs, and the quantity which they destroy... | |
 | 1862 - 476 páginas
...closely observed, and the results ascertained and computed. It has been concluded that by no agency save that of little birds can the ravages of insects be kept down. There are some birds which live exclusively upon insects and grubs, and the quantity which they destroy... | |
 | Edmund Morris - 1865 - 276 páginas
...closely observed, and the results ascertained and computed. It has been concluded that by no agency, save that of little birds, can the ravages of insects be kept down. There are some birds which live exclusively upon insects and grubs, and the quantity which they destroy... | |
 | Edmund Morris - 1864 - 266 páginas
...closely observed, and the results ascertained and computed. It has been concluded that by no agency, save that of little birds, can the ravages of insects be kept down. There are some birds which live exclusively upon insects and grubs, and the quantity which they destroy... | |
 | 1865 - 458 páginas
...closely observed, and the results ascertained and computed. It has been concluded that by no agency save that of little birds can the ravages of insects be kept down. There are some birds which live exclusively upon insects and grubs, and the quantity which they destroy... | |
 | New Hampshire. Department of Agriculture - 1873 - 712 páginas
...minutely experimented for several years, comes to the conclusion from his researches : " Birds are in general far more useful than hurtful to the agriculturist,...earth will speedily become a wilderness, a waste, a deseit. PROPEH RALANCE NECESSARY. would destroy the products of his fields and his flocks. He cannot... | |
 | Edmund Morris - 1905 - 284 páginas
...closely observed, and the results ascertained and computed. It has been concluded that by no agency, save that of little birds, can the ravages of insects be kept down. There are some birds which live exclusively upon insects and grubs, and the quantity which they destroy... | |
 | 1861 - 806 páginas
...interesting abstract of the Report presented by these gentlemen i—" It has been concluded that by no agency save that of little birds can the ravages of insects be kept down. There are some birds which live exclusively upon Insects and grubs, and the quantity which they destroy... | |
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