Within recent years much has been added to the knowledge con"
cerning the mechanism of the respiratory function of the blood.
Haldane and Priestley (1905) have shown that, at least in the higher
animals, the respiratory movements are affected by the carbon
dioxide tension of the arterial blood. It has been shown definitely
(Hasselbalch, 1912 and citations) that the exciting agent is the
hydrogen ion concentration of the blood bathing the respiratory
center.
Krogh and L eitch (1919) undertook to study the respiratory function
of the blood of fishes in view of the knowledge of the influence of
temperature upon the dissociation curve of oxyhemoglobin asinvestigated
by Barcroft and Hill (1909) and Barcroft (1914). These
workers found that the blood of the fish was especially adapted to
its needs.
Certain marine fishes are known to react to a gradient of acidity
and alkalinity (Shelford and Powers, 1915). It has been found that
certain species react positively to a definite range of hydrogen ion
concentration of the sea water, others are less definite in their reaction,
and still others seemingly do not respond to differences in alkalinity
and acidity (Powers, 1921).
In view of these facts experiments were undertaken to determine
the ability of marine fishes to extract oxygen from the sea water at
different hydrogen ion concentrations. Interest in this question was
Within recent years much has been added to the knowledge con"
cerning the mechanism of the respiratory function of the blood.
Haldane and Priestley (1905) have shown that, at least in the higher
animals, the respiratory movements are affected by the carbon
dioxide tension of the arterial blood. It has been shown definitely
(Hasselbalch, 1912 and citations) that the exciting agent is the
hydrogen ion concentration of the blood bathing the respiratory
center.
Krogh and L eitch (1919) undertook to study the respiratory function
of the blood of fishes in view of the knowledge of the influence of
temperature upon the dissociation curve of oxyhemoglobin asinvestigated
by Barcroft and Hill (1909) and Barcroft (1914). These
workers found that the blood of the fish was especially adapted to
its needs.
Certain marine fishes are known to react to a gradient of acidity
and alkalinity (Shelford and Powers, 1915). It has been found that
certain species react positively to a definite range of hydrogen ion
concentration of the sea water, others are less definite in their reaction,
and still others seemingly do not respond to differences in alkalinity
and acidity (Powers, 1921).
In view of these facts experiments were undertaken to determine
the ability of marine fishes to extract oxygen from the sea water at
different hydrogen ion concentrations. Interest in this question was
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