The Hemolymph Nodes of the Sheep (Volume 17)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914. Excerpt: ... THE HEMOLYMPH NODES OF THE SHEEP Studies On Hemolymph Nodes, I CONTENTS. Distribution, occurrence and appearance. Lymphatic and vascular relations. The microscopic structure. The cellular content. The question of mixed nodes. The genesis of intermediate forms. Classification. Functions. References. INTRODUCTION Although a number of species were investigated, this paper has purposely been limited to the sheep (Ovis aries), in order that a more comprehensive review of large numbers of hemolymph nodes could first be made. For even a slight familiarity with the subject makes it evident that it is not only necessary to examine many nodes in the different regions of the same animal, but also to examine large numbers in different animals, and perhaps of animals of varying ages as well. Moreover, a very comprehensive comparative study, although probably indispensable for the elucidation of some of the intricate problems of structure, function and development, usually introduces many additional and related problems which tend to obscure the issue regarding a single species. By first subjecting one species to a thorough examination the problem can also be better defined, many conflicting statements can be ignored, and much confusion avoided. It also seemed probable that an initial and careful comprehensive examination of one species would make it possible to decide with some degree of certainty whether, as recently and so often before reiterated, these organs in a given species are true hemolymph nodes or not, and whether a transformation of hemolypmh nodes into hemal or lymphatic nodes takes place. To this, and to some other questions, an unusually large collection of material and a series of observations of some magnitude seem to justify a definite, even if not a...