Through a microscope : something of the science, together with many curious observations indoor and out and directions for a home-made microscope / by Samuel Wells, Mary Treat and Frederick Leroy Sargent.

  • Wells, Samuel, 1965-
Date:
[1886]
Catalogue details

Licence: Public Domain Mark

Credit: Through a microscope : something of the science, together with many curious observations indoor and out and directions for a home-made microscope / by Samuel Wells, Mary Treat and Frederick Leroy Sargent. Source: Wellcome Collection.

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    Now cut the blossom in halves from the stem up. It will be seen that the stem is hollow and ends above in a cushion-like expansion. From the upper surface of this grow a number of little flowers, while from the sides there sprang two rows of little green organs that enclose the flower cluster like a cup. Remove one of the flowers with the forceps and place it in a drop of water on the glass stage of the microscope. Examine with one and one half inch power. * Be careful to get just the focus. You are now ready to see the general form of the flower. At the base is a little body with roughened sides and slightly narrowed above (the ovary). Springing from the top of the ovary are a number of*fine bristles (the pappus). Inside the bristles is a yellow portion, tubular below and flat above (the *In these directions “ iX in. power” means a lens having a focus of iX inches; “ X in. power means a lens or combination of lenses having a focus of X inch ; and so on. All the different powers mentioned in the directions may be obtained in the small-sized 3-lens, bellows form magni- fier, either by using the lenses singly or combined in different ways. The magnifying power of any single lens or simple combination is easily found by dividing 10, by the focus in inches. Thus the magnifying power of a X in. lens is found in this way: 10-rX = iox£ 20. The lens magnifies therefore 20 diameters t. e. makes an object appear twenty times as long and twenty times as broad as it is.