V 



anatomical monographs on previously undescribed species of animals 

 (Narcine, Bronchiobdella, Enchytrceus), one or two contributions to 

 descriptive human anatomy, and (in addition to the Latin dissertation 

 already referred to) four of those investigations into the minute struc- 

 ture of the animal body, which afford the best justification for 

 placing him, as we have done, side by side with Theodore Schwann, 

 as one of the founders of the Science of Histology — namely, the Essay 

 on the Structure of the Lacteal System, which served for his " Habi- 

 litation " Thesis, and three other papers on the Distribution of the 

 Epithelium in the Human Body, on the Formation of Mucus and Pus, 

 and on the Structure and Development of Human Hair. 



In 1840, when Henle was thirty years old, he received a call to the 

 Chair of Anatomy at Zurich, where he remained until, in 1844, he 

 became the colleague of Tiedemann, at Heidelberg. The year after 

 his Zurich appointment he published his " General Anatomy," already 

 referred to ; and about the same time, in co-operation with Professor 

 J. Miiller, he published a zoological work on Sharks and Rays, for 

 which the collection of the British Museum afforded part, at all 

 events, of the material. 



In Heidelberg, Henle, like Miiller, taught both anatomy and physi- 

 ology, as well as pathology. Almost immediately after his settlement 

 in that university, he began with Pfeiffer, who had accompanied him 

 from Zurich, the " Zeitschrift fur rationelle Medicin," which, after 

 sharing the first place with " Virchow's Archiv" in medical periodical 

 literature for a quarter of a century, gave place to the new order in 

 1872. During the last sixteen years of its existence the Journal was 

 enriched by the publication in it of Henle's own annual account of 

 the progress of anatomical and physiological science — a fact which, 

 irrespectively of its other contents, will give its fifty-four volumes a 

 permanent place in medical literature. As all who were then engaged 

 in the study of biology know, Henle's " Berichte " had no analogy to 

 the half reliable and unappreciative abstracts which the enormous 

 growth of periodical literature have now made a necessary evil. They 

 consisted rather of records by a master hand of all that was worthy 

 of being remembered, and critical reviews of all that was worthy of 

 being discussed in its bearing on the development of the branches of 

 science to which they related. So that whoever undertakes the Her- 

 culean task of writing the history of that time of rapid progress in 

 biology which began about the time of Henle's removal from Berlin to 

 Zurich, will find the chief events of those thirty years continuously 

 chronicled (first in " Muller's Archiv/' then in " Canstalt's Jahres- 

 berichte," and finally, as above stated, in the " Zeitschrift ") by one 

 who himself took a prominent part in them. 



In 1852 Henle was called from Heidelberg to Gottingen, and it was 

 here that the chief work of his life, the preparation of the Descriptive 



