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 



