The World of Matter a Guide to the Study of Chemistry And Mineralogy
The World of Matter a Guide to the Study of Chemistry And Mineralogy
Harlan H Harlan Hoge Ballard
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3. How many different sciences contribute to a com- plete understanding of minerals? 4. What is Hopkins' law of the conditioning and conditioned ? 5. Give an illustration of its working. 6. Give the natural order of studying the sciences in accordance with this law. WHAT IS A METAL? 179 CHAPTER XX. , WHAT IS A METAL? We have now become somewhat familiar with eleven of the most common and abundant elements, namely, oxygen, hydrogen, nitrogen, chlorine, carbon, silicon, sodium, potassium, calcium..., aluminum, and iron; and we have incidentally become acquainted with quite a number of their more important compounds. It is now time to compare these elements with one another for the purpose of arranging them if possible in groups or classes. To clo this properly we must group together ele- ments which have certain properties in common, and the more essential and important the properties are which we select as a basis for our classification, the better our work will be. Every mind, whether edu- cated or not, is more or less constantly busy in classifying the objects with which it becomes acquainted.
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