The book The Recent Development of Physical Science was written by author Dampier, William Cecil Dampier, Sir, 1867-1952 Here you can read free online of The Recent Development of Physical Science book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Recent Development of Physical Science a good or bad book?
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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.
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