Cornell Nature-Study Leaflets / Being a selection, with revision, from the teachers' leaflets, home nature-study lessons, junior naturalist monthlies and other publications from the College of Agriculture, Cornell University, Ithaca, N.Y., 1896-1904

by New York State College of Agriculture

5. How does the bark on the trunk differ from that on the branches?

6. How does the bark on the trunk of a maple tree differ from that on the trunk of a soft maple or an elm?

7. What work for the tree do the trunk and branches perform?

8. Is the tree tapped on all sides? If not, why?

9. How deep must the spiles be driven successfully to draw off the sap?

10. Would you tap a tree directly above or at the same spot tapped last year; or would you place two spiles one above the other? Give reasons.

11. Why does the sap flow more freely on warm days after cold nights?

12. Is the sap of which we make sugar going up or down?

13. How does the sugar come to be in the sap?

14. Why is the sugar made during the "first run" better than that which is made later? Why cannot you make sugar in the summer?