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Subsequent investigations have proved that they include a great variety of beings: some of them belonging to the type of Mollusks; others to the type of Articulates, being in fact little Shrimps; while many others are the locomotive germs of plants, and so far from forming a class by themselves, as a distinct group in the Animal Kingdom, they seem to comprise representatives of all types except Vertebrates, and to belong in part to the Vegetable Kingdom, Siebold, Leuckart, and other modern zoölogists, have considered them as a primary type, and called them Protozoa; but this is as great a mistake as the other.
The fourth, that of Cuvier, and Anatomical systems, with the classifications of Cuvier, Lamark, De Blainville, Ehrenberg, Burmeister, Owen, Milne-Edwards, Von Siebold and Stannius, Leuckart. The fifth section includes the Physiophilosophical systems, with diagrams of Oken's and Fitzinger's classifications, and a special article for the circular groups of McLeay.
Joseph Leidy found the cysts of trichina in the tissues of pork; and another decade or so elapsed after that before German workers, chief among whom were Leuckart, Virchow, and Zenker, proved that the parasite gets into the human system through ingestion of infected pork, and that it causes a definite set of symptoms of disease which hitherto had been mistaken for rheumatism, typhoid fever, and other maladies.
Indeed, it is only within the last thirty years that the splendid patience of Von Siebold, Van Beneden, Leuckart, Küchenmeister, and other helminthologists, has succeeded in tracing every such parasite, often through the strangest wanderings and metamorphoses, to an egg derived from a parent, actually or potentially like itself; and the tendency of inquiries elsewhere has all been in the same direction.
We can now, in the light of the researches of Siebold, Leuckart, Ganin and others, trace more closely than ever the connection between simple growth and metamorphosis, and metamorphosis and parthenogenesis, and perceive that they are but the terms of a single series.
This is especially clear in the case of those mammals in which the true female uterus bifurcates, for in the males of these the vesicula likewise bifurcates. Leuckart, in Todd's 'Cyclopaedia of Anatomy' 1849-52, vol. iv. p. 1415. The bearing of the three great classes of facts now given is unmistakeable.
Of the professors then at Heidelberg, Leuckart, the zoologist, was, perhaps, the most inspiriting. His lectures were full of original suggestions and clever hypotheses, which excited and sometimes amused his listeners.
Lesson, on the birds of paradise; on the sea-elephant. Lessona, M., observations on Serranus. Lethrus cephalotes, pugnacity of the males of. Leuciscus phoxinus. Leuckart, R., on the vesicula prostatica; on the influence of the age of parents on the sex of offspring. Levator claviculae muscle. Libellula depressa, colour of the male.
It is true that I was still obliged to give up a part of my time to the study of medicine, but while advancing in my professional course by a steady application to anatomy and physiology, I attended the lectures of Leuckart in zoology, and those of Bronn in paleontology. The publication of Goldfuss's great work on the fossils of Germany was just then beginning, and it opened a new world to me.
Professor Leuckart, who till now represented zoology here, is called to Freiburg, and you would therefore be the only teacher in that department. The university being so frequented, a numerous audience may be counted upon. The zoological collection, by no means an insignificant one, is open to your use. Professor Leuckart received a salary of five hundred florins.
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