264 BIOLOGY AND ITS MAKERS 
self in an atmosphere of jealous criticism, largely on account 
of his being elevated to the station of dean, and after two 
years of discomfort he resigned the deanship, but retained 
his position as a professor in the university. He secured a 
residence in a retired spot near a church, and lived there 
simply. In his leisure moments he talked frequently with 
the priests, and became a devout Catholic. 
His contributions to science cover a wide range of subjects. 
In his microscopic work he discovered the rhizopods in 1834, 
and the study of their structure gave him the key to that of 
the other protozoa. In 1835 he visited the Mediterranean, 
where he studied the oceanic foraminifera, and demonstrated 
that they should be grouped with the protozoa, and not, as 
had been maintained up to that time, with the mollusca. 
It was during the prosecution of these researches that he 
made the observations upon sarcode that are of particular 
interest to us. 
His natural history of the infusoria (1841) makes a vol- 
ume of 700 pages, full of original observations and sketches. 
He also invented a means of illumination for the microscope, 
and wrote a manual of microscopic observation. Among the 
ninety-six publications of Dujardin listed by Professor Joubin 
there are seven general works, twenty relating to the protozoa, 
twenty-four to geology, three to botany, four to physics, 
twenty-five to arthropods, eight to worms, etc., etc. But as 
Joubin says: ‘‘The great modesty of Dujardin allowed him 
to see published by others, without credit to himself, numer- 
ous facts and observations which he had established.” This 
failure to assert his claims accounts in part for the inadequate 
recognition that his work has received. 
No portrait of Dujardin was obtainable prior to 1898. 
Somewhat earlier Professor Joubin, who succeeded other 
occupants of the chair which Dujardin held in the University 
of Rennes, found in the possession of his descendants a 
