254 
In Memoriam 
the country, his many practical duties never preventing him from 
following his bent for natural history. He collected an extensive 
herbarium, many Coleoptera, Lepidoptera and Spiders. His ability 
as an artist is well shown in his beautifully illustrated publications 
on spiders and ticks. 
In 1880 he journeyed to Europe and returned to Southern Japan, 
where he resided at Saga. 
In 1886 Ddnitz returned to Berlin where he became associated with 
Robert Koch, first at the Hygienic Institute and afterwards at the 
Institut flir Infektionskrankheiten, which was founded in 1891. In 
1893 he directed the Bacteriological Laboratory at Bonn and concerned 
himself with cholera investigations. In 1896-9 he was a member of 
the Institut flir Serumforschung und Therapie at Steglitz of which 
Paul Ehrlich was director. This Institute gave rise subsequently to 
the Institut fiir Serumtherapie at Frankfurt. Ddnitz, however, re¬ 
mained in Berlin where he was put in charge of the Krankenabteilung 
of the Institute for Infectious Diseases, and he received the title of 
Geheimer-Medizinalrat. In later years he w'as appointed director 
of the Scientific Department of the Institute to which he remained 
attached until his death. During the many years of Robert Koch’s 
absence in the Tropics, Ddnitz acted as director in his place. 
A perusal of the appended bibliography of his published works, 
which I believe to be complete, will convince the reader that Ddnitz 
was a man of very wide knowledge and singular ability. It is 
a pleasure to acknowledge the kind aid I have obtained from the 
Ddnitz family in writing this notice and completing the bibliography. 
In the latter the publications are grouped under various headings to 
facilitate reference. 
His contributions to parasitology were of considerable importance. 
He handled a great part of the rich material collected by Robert Koch 
in many parts of the world, more especially the collections of mosquitoes 
and ticks. In 1901-3 he described 12 new species of Anopheles. 
His papers on ticks (1905-1910) constitute contributions of the first 
order, for he threw a great deal of light upon the subject of their 
classification, apart from giving short and accurate descriptions of new 
or known species. He was the first to point out that the ornamentation 
in Amhlyomma and other Ixodidae depended upon their internal 
structure and could, in consequence, be relied upon as a means of 
classification. With his wide knowledge of zoology he also possessed 
to a conspicuous degree the ability to seize upon the essential characters 
