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Hydrastine (Classic Reprint)

Hydrastine (Classic Reprint)

          
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About the Book

Excerpt from Hydrastine

For the determination of the crystalline form of the alkaloid some carefully selected and handsomely devel oped crystals were also furnished me by Professor Lloyd. By the crystallization of relatively small amounts, the faces of the crystals are rarely, if ever, perfectly devel oped, and, even when operating upon larger quantities, this is also frequently the case, from the fact that the crystals almost invariably form with their lateral surfaces attached to the sides of the crystallizing vessel.

The crystals, which attain a maximum length of from eight to ten millimeters, have the form of four sided prisms (fig. I. And and apparently belong to the ortho-rhombic system, although the goniometer at my disposal did not admit of the exact measurement of the angles. The drawings here presented, which rep resent typical crystals, were formed by making an ortho graphic projection, and the angles may be said to be as geometrically accurate as is possible to obtain them without absolute measurements. In Fig. II. The ter minal faces are shown to be very perfectly developed, while Fig. I. Represents a crystal as viewed somewhat from the side and from above, the terminal faces not so symmetrically developed, and therefore having a some what more complicated form. It is interesting to ob serve that when both ends of the crystals are devel oped, as shown in Fig. I., the corresponding terminal faces of opposite ends are invariably inclined to each other at an angle of exactly 90 degrees.

About the Publisher

Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.


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Product Details
  • ISBN-13: 9781397325884
  • Publisher: Forgotten Books
  • Publisher Imprint: Forgotten Books
  • ISBN-10: 1397325887
  • Publisher Date: 12 Feb 2019


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