Oil is also made from fish. From parts of the cod an oil very useful for medicine is obtained. From other fish, lamp oil and machine oil are pressed. A little fish in the Caspian Sea is so oily that when it is dried its body burns with a clear light. These dried fish are used as candles. When the Cossacks get hungry, and have nothing else for supper, they eat their fish candles. That terrible fish, the shark, is very useful after he is dead. From his fins, fine gelatine is made. From his skin, a leather-like substance called shagreen is prepared. Shagreen is used in polishing wood, and for covers of portfolios, instrument-cases, and the like. From the bones of the shark, buttons and ornaments are made, and very costly canes from his backbone. His teeth are very hard and white, and are often mounted in gold and sold for ornaments. There are many large and interesting books about fisheries, manufactures of articles from fish, and about the various kinds of fish, and their habits and uses. I hope you will try to get some of these books to read. In fact, I hope you will pursue for yourselves all these studies in nature which we have begun in the Nature Readers. REVIEW LESSONS. I. 1. What are some of the things which we get from the earth? 2. Why do we say “Mother Earth”? 3. What do we say are the eldest children of Mother Earth? 4. What is a plant? 5. What is the chief food of plants? 6. What are some of the things that plants can do? 7. How do animals get most of their mineral food? 8. Do plants take their food in liquid or solid form? 9. What partners have plants taken? 10. What is the business of plants? 11. What good does that business do us? 12. How large are some of the largest plants? 13. How small are some of the smallest plants? 14. What can you say of the length of a plant’s life? 15. What two great divisions of plants are there? 16. What are the six parts of a perfect plant? 17. What is a tendril? 18. Are any of the parts of a plant ever wanting? 19. Of what use to a plant is the root? 20. What are the true roots of plants? 21. What are these thicker parts which are usually called roots? 22. What is a plant stem? Of what use is it? 23. Tell me something about leaves. 24. With what does a plant begin and end? 25. Have plants more than one crop of seeds? 26. What is an annual plant? 27. Will you describe the sprouting of the seed? 28. What is a stamen? 29. What is a pistil? 30. Describe the seed-case. 31. What are the only really necessary parts of a flower? 32. Where does the growth of a plant begin? 33. What is a hardy seed? 34. How do plants grow? 35. What can you say about the plant’s need of moisture? 36. What is the blood of the plant? 37. What two kinds of sap are there in a plant? 38. Tell me about the tubes and cells. 39. Through what does the plant breathe? 40. How does the sap get changed in the leaf? 41. What can you say about starch in plants? 42. What about sugar?