Parasites of swine / Maurice C. Hall.

  • Maurice Crowther Hall
Date:
[1924]
Catalogue details

Licence: Public Domain Mark

Credit: Parasites of swine / Maurice C. Hall. Source: Wellcome Collection.

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    nical wording as possible. To accomplish this task without sacrificing technical information in order to make these books more readable for the veterinarian, a certain arrangement of the subject matter has been adopted. It is assumed that as a rule the veterinarian is interested mostly in parasitic species and but little in general in higher groups. The parasites are therefore dealt with in detail as species under their various hosts for the benefit of the veterinarian, and to facilitate find¬ ing these species the common names of the parasites and such com¬ monly used scientific names as have fallen into synonomy are given in connection with the correct scientific names and are covered in the index. In this way it should be possible for the veterinarian to find specific parasites regardless of alterations in nomenclature. For the benefit of the parasitologist and such veterinarians as are specially interested in parasitology, dealing with material which is to be identi¬ fied or concerning which the known technical facts are desired, a taxonomic section, dealing with groups from genera to phyla and in¬ cluding keys down to species, is incorporated in a separate volume to appear as the last of this series. The field covered by this book is too large for one writer to pass critical judgment on many of the topics, and in general the present writer has accepted new species, genera, etc., as proposed by various writers, regardless of his personal opinion of the new names, except in those fields where a first-hand knowledge or the decided weight of authority warrants passing a critical judgment. New findings may seem highly improbable and yet be true. It is therefore unsafe to reject statements merely because they do not accord with previous concepts, especially where no evidence is supplied for examination and the competency of the authority is unknown. It has been remarked by Leuckart, Cobbold, Rodenwaldt and Roeckemann and others that the field of parasitology is a field of surprises. Parasites which are of rare and perhaps accidental occurrence or of no known economic importance are accorded as full discussion as available information permits of and the place of these volumes in the field of veterinary parasitology could warrant, since experience shows that we may be mistaken in regarding these parasites as unimportant and because these are the parasites which take excessive amounts of the parasitologist's time when they are presented for identification, owing to their sketchy treatment or omission in most text and refer¬ ence books and the necessity for a prolonged search through the litera¬ ture.
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