Studies in Science for Seventh and Eighth Grades and Junior High Schools. E-book. Formato PDF Alice Jean Patterson   -  Forgotten Books, 2017  - 

Part Two emphasizes, in its biological phases, animal life and projects, but takes up also some of the lower plant forms, and the more difficult problems of plant propagation. The physical studies during the winter are based upon water sup ply, heating, lighting and ventilating the home and school. In the spring, simple problems of landscape gardening are introduced.