Farm Development: An Introductory Book in Agriculture, Including a Discussion of Soils, Selecting & Planning Farms, Subduing the Fields, Drainage, Irrigation, Roads, Fences, Together with Introductory Chapters Concerning Farm Business, and the Relations of General Science to AgricultureOrange Judd Company, 1910 - 391 páginas |
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Página 36
... feet thick , extending southward far into the Mississippi valley basin in America and another sheet extending into the central part of Eurasia . This sheet of accu- mulated snow and ice was called the great glacier . In the beginning ...
... feet thick , extending southward far into the Mississippi valley basin in America and another sheet extending into the central part of Eurasia . This sheet of accu- mulated snow and ice was called the great glacier . In the beginning ...
Página 37
... feet in thickness . We would expect that this ice would lie quietly on the surface of the earth , but it is found that ice will flow to a lower level , as will water , though very slowly . This fact is illustrated by pressing a chunk of ...
... feet in thickness . We would expect that this ice would lie quietly on the surface of the earth , but it is found that ice will flow to a lower level , as will water , though very slowly . This fact is illustrated by pressing a chunk of ...
Página 47
... the overlying limestone , which broke off in large masses and was washed away . Thus the falls had receded northwestward about six miles to within a few hundred feet of the present site , when they. GEOLOGICAL HISTORY OF THE EARTII 47.
... the overlying limestone , which broke off in large masses and was washed away . Thus the falls had receded northwestward about six miles to within a few hundred feet of the present site , when they. GEOLOGICAL HISTORY OF THE EARTII 47.
Página 48
... feet of the present site , when they were first discovered by the European explorers , and named the Falls of St. Anthony . From comparisons of descrip- tions and drawings made by the earliest explorers , and pictures taken at later ...
... feet of the present site , when they were first discovered by the European explorers , and named the Falls of St. Anthony . From comparisons of descrip- tions and drawings made by the earliest explorers , and pictures taken at later ...
Página 51
... feet and the plowshare on the bottom of the furrow . 66 The soil is usually made up of a framework of more or less finely divided mineral particles , of partially decayed inorganic particles , of water , of air , of small quantities of ...
... feet and the plowshare on the bottom of the furrow . 66 The soil is usually made up of a framework of more or less finely divided mineral particles , of partially decayed inorganic particles , of water , of air , of small quantities of ...
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Farm Development; An Introductory Book in Agriculture, Including a ... W. M. Hays Sin vista previa disponible - 2017 |
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acre agricultural animals better biped bottom brace building canal capillary capillary action capstan carry cement cents clay clover construction corn corner post cost crop rotation crops cubic yard cultivation culverts datum deep depth drain tiles drainage earth engine expense farm home farmers farmstead feet fence fields flood water flow Fresno scraper furrow-slice furrows gate glacial glacier grade grain Grass gravel ground water height Illustrated inches instrument irrigation labor lake Lake Agassiz layer limestone low area macadam material mile Minnesota Minnesota river Mississippi river mixed moisture necessary open ditch outlet particles peat plow practical profitable rain rainfall reversible road machine river road roller roadside roadway rock roots rotation rural sand schools showing shown in Figure side soil spade station stone stream stumps subsoil tile drains tion tivated trees wagon wheat wire fence