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What is the field of study of this research?
Options: biology, chemistry, physics, psychology, etc

Abstract: This volume belongs to the series Monographs on Physiology" whose function is "to set out the progress of physiology in those chapters in which the forward movement is the most pronounced."
No one can deny that this volume is justified. Within recent years, interest in this field of physiology has flared up, and, for this, Professor Verzar is chiefly responsible. Moreover, the subject of absorption usually receives but scant attention in physiological text books. The first quarter of the book deals with the histology of the gut and with physical and physiological processes involved in absorption. The great bulk of the remainder of the book discusses the absorption of water, salts, carbohydrates and fats. This again is to be expected, since it is just with this aspect of absorption that Professor Verzar has been concerned. His postulate that phosphorylation is concerned in the specific absorption of glucose and of galactose among the carbohydrates and also plays a part in fat absorption will be familiar to readers of his papers. His emphasis on the hydrotropic action of bile salts is also well known.
The chapters dealing with the absorption of Fe, Cu, Mn, Ca and P are disappointing, considering the importance of these elements. Although he is not personally engaged in research on the absorption of these elements, it would have been valuable to have had Professor Verzar's own critical attitude to the problems involved. Some of the historical matter in other chapters could with advantage be eliminated to make way for such an extension of the monograph.
The bibliography is very full, but references to books should have the publisher's name and place of publication in addition to the name of the author.-R. C. Garry.
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Field of study: Biology
The research discusses how the body absorbs water, salts, carbohydrates, and fats.