ot but feel that they have now at
command not only accurate results obtained by careful observation, but
the foundation on which the superstructure has been built up--exquisite
but simple methods of research. Ehrlich's methods may be (and have
already been) somewhat modified as occasion requires, but the principles
of fixation and staining here set forth must for long remain the methods
to be utilised in future work. His differential staining, in which he
utilised the special affinities that certain cells and parts of cells
have for basic, acid and neutral stains, was simply a foreshadowing of
his work on the affinity that certain cells and tissues have for
specific drugs and toxins; the study of these special elective
affinities now forms a very wide field of investigation in which
numerous workers are already engaged in determining the position and
nature of these seats of election for special proteid and other poisons.

The researches of Metschnikoff, of Kanthack and Hardy, of Muir, of
Buchanan, and others, are supplementary and complementary to those
carried on in the German School, but we may safely say that this work
must be looked upon as influencing the study of blood more than any that
has yet been published. It is only after a careful study of this book
that any idea of the enormous amount of work that has been contributed
to haematology by Ehrlich and his pupils, and the relatively important
part that such a work must play in guiding and encouraging those who are
interested in this fascinating subject, can be formed.

The translation appears to have been very carefully made, and the
opportunity has been seized to add notes on certain points that have a
special bearing on Ehrlich's work, or that have been brought into
prominence since the time that the original work was produced. This
renders the English edition in certain respects superior even to the
original.

G. SIMS WOODHEAD.

NOTE BY THE TRANSLATOR.

This translation of the first part of _Die Anaemie, Nothnagel's Specielle
Pathologie und Therapie_, vol. VIII. was carried out under the personal
guidance of Professor Ehrlich. Several alterations and additions have
been made in the present edition. To my friend Dr Cobbett I owe a debt
of gratitude for his kind help in the revision of the proof-sheets.

W. M.

CONTENTS.