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The ovum then begins to grow, dividing itself into portions that go to make the different parts of the body. Before I continue, let me remind you that the ovum in the beginning is only about as large as the point of a pin, being about 1-125 of an inch in diameter, while the spermatozoon is so tiny it cannot be seen without the aid of a miscroscope.
Where the scale is 1-125,000, a page of the atlas-sheet will represent one-fourth of a degree. Where the scale is 1-62,500, the atlas-sheet will represent one-sixteenth of a degree. The degree sheet will be designated by two numbers one representing latitude, the other longitude.
Over much of this area the sheets of the map will also be constructed on a scale of 1-250,000, but in special districts that scale will be increased to 1-125,000, and in the case of important mining districts charts will be constructed on a much larger scale. In the eastern portion of the United States two scales are adopted.
In the less densely populated country a scale of 1-125,000 is used; in the more densely populated regions a scale of 1-62,500 is adopted, or about one mile to the inch. But throughout the country a few special districts of great importance, because of complex geologic structure, dense population, or other condition, will require charts on still larger scales.
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