in the atmospheric air by respiration, have been
traced; their relative quantities, in different
species, at different ages, and in different temperatures,
have not been ascertained. I think
it would yield some interesting results to compare
these quantities, with the irritability of the muscular
fibre on one hand, and with the tenacity
of life on the other. I imagine they will be
found to be inversely as these properties. This
is an investigation beset with difficulties. But
if these difficulties can be overcome, it is plain
to me that one of the most important of the
Laws of living beings will he established.
Accept my best thanks for your ready and
able co-operation in these researches, and believe
me to be,
My dear Sir,
Very faithfully yours,
MARSHALL HALL.
14 M a n c h e s t e r S q u a r e ,
O c t . 12, 1831.
CONTENTS.
INTRODUCTION.
OF THE PRINCIPLES OF INVESTIGATION
IN PHYSIOLOGY - -
CHAPTER I.
OF THE ANATOMY OF THE MINUTE AND
CAPILLARY VESSELS
I. OF THE MINUTE AND CAPILLARY
VESSELS OF THE SYSTEMIC CIRCULATION
-
1. Of the Minute and Capillary Vessels
in the Fin and Tail of the
tSticlcle-bacJc -
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