Provides lessons on many topics of nature study, with questions that may form the basis for student projects.The milch cow is a milk-making machine, and the more fuel (food) she can use, the greater her production. Cornell Ollie ... However, if a farmer is producing milk it pays him well to get the best possible machine to make it, and that is alwaysanbsp;...
|Title||:||Handbook of Nature Study|
|Author||:||Anna Botsford Comstock|
|Publisher||:||Cornell University Press - 1939|