Bauhaus-Universität Weimar

PREFACE. 
VU 
copiousness of facts and illustrations which constitutes so distinguish¬ 
ing a merit in the larger work, has been retained in the abridge¬ 
ment. In the latter, as in the former, the student will find those 
wonderful revelations in histogeny which make an era in the his¬ 
tory of physiology, and which, although the last discovered, must, 
henceforth, be regarded as essential preliminaries to future descrip¬ 
tions of tissues and organic functions. In these pages, the student 
will become acquainted with the results of the discoveries and ob¬ 
servations of Schleiden, Schwann and Valentin on the formation of 
the most different elementary tissues of plants and animals, by the 
development of primitive or nucleated cells out of structureless or 
unformed gummy and mucous substances,—and of Barry and others on 
embryology, showing a similar development of various tissues and 
organs from the ovum, quickened into vital activity by the stimulus of 
spermatozoa, and growing by the evolution from and addition to its own 
primitive one, of fresh cells. Similar nucleated cells are found to exist 
in or rather to make up the globules of the blood, and are readily 
evolved from Coagulated fibrin; proving this fluid to be, conformably 
with long observation, the formative and vitalizing one. From these 
facts, in perfect harmony with each other, we are able at last to deduce 
a general theory of vegetation and organisation. 
So important are the new views of histogeny, that it has been thought 
advisable to transfer the chapter containing them from the end of the 
large work, where it was placed, to the beginning of Special Phy¬ 
siology in the present volume. In natural relation to the subject of the 
original formation of the tissues, is that of their regeneration or repro¬ 
duction, with or without inflammation, and, on this account, the descrip¬ 
tion of the latter is removed from the place which it occupied to that 
immediately following histogeny. Another deviation from the arrange¬ 
ment of the author will be found in bringing in the chapters on Diges¬ 
tion immediately after those on Respiration, in place of letting them 
remain after Nutrition and Secretion; and in making the chapters on 
Secretion precede those on Nutrition and Growth, rather than allow 
them to follow, as they do in the original. The progressive order of 
the changes to which aliment is subjected, from its introduction into 
the stomach to its conversion into blood, and the consequent metamor¬ 
phosis of this fluid into secretions and matters for nutritive deposit 
and the growth of the tissues, are exhibited better in the modified than 
in the original arrangement. 
A few notes at the foot, and some paragraphs in the body, of the 
page, have been added by the editor, who did not feel himself free to 
do much in this way, when his office was to abbreviate and arrange.
        

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