The Recent Development of Physical Science
The Recent Development of Physical Science
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In our eReader you can find the full English version of the book. Read The Recent Development of Physical Science Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Recent Development of Physical Science
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Pfe£Fer made a further examination of these semi-permeable membranes, as they have been called, and by their use obtained results of great importance in the study of biology.
A porous pot of unglazed earthenware, six to eight centimetres high and two or three centi- metres in diameter, is sealed by means of sealing- wax to a glass tube, as shown in Fig. 25. Having been thoroughly washed, it is filled with the solu- tion of a salt, such as potassium ferro-cyanide, and the outside is then surroun...ded with the solution of another salt, such as copper sulphate or ferric chloride, which gives an insoluble precipitate when in contact with the first salt. The two solutions gradually di£Fuse from opposite sides into the walls of the cell, and form an insoluble mem- brane where they meet inside the thickness of the walls. This process can be hastened, and the resulting membrane improved, by forcing the salts into the porous material by means of an electric current. The solutions are washed away, and the wide glass tube is drawn out and sealed to a smaller tube in the manner shown in the figure.
What to read after The Recent Development of Physical Science?
You can find similar books in the "Read Also" column, or choose other free books by Dampier, William Cecil Dampier, Sir, 1867-1952 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Pfe£Fer made a further examination of these semi-permeable membranes, as they have been called, and by their use obtained results of great importance in the study of biology.
A porous pot of unglazed earthenware, six to eight centimetres high and two or three centi- metres in diameter, is sealed by means of sealing- wax to a glass tube, as shown in Fig. 25. Having been thoroughly washed, it is filled with the solu- tion of a salt, such as potassium ferro-cyanide, and the outside is then surroun...ded with the solution of another salt, such as copper sulphate or ferric chloride, which gives an insoluble precipitate when in contact with the first salt. The two solutions gradually di£Fuse from opposite sides into the walls of the cell, and form an insoluble mem- brane where they meet inside the thickness of the walls. This process can be hastened, and the resulting membrane improved, by forcing the salts into the porous material by means of an electric current. The solutions are washed away, and the wide glass tube is drawn out and sealed to a smaller tube in the manner shown in the figure.
What to read after The Recent Development of Physical Science?
You can find similar books in the "Read Also" column, or choose other free books by Dampier, William Cecil Dampier, Sir, 1867-1952 to read onlineMoreLess
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