Obituary. 557 



Jersey, 1908 ; xii. and 120 pp.), and also to the examination of 

 the diatomiferous material collected by the ' Belgica ' Expe- 

 dition. We may hope that the fruits of the patient and con- 

 scientious toil of the learned micrographer may not be lost, and 

 that some competent person will continue the work of our re- 

 gretted colleague. 



Henri van Heurck had numerous friends, and in the case of 

 several of those friends who predeceased him he published affecting 

 biographies extolling their merits ; for instance, C. Janisch, E. 

 Weissflog, J. Deby, C. Haughton Gill, E. Mauler, F. Kitton, 

 J. J. Kinker. In this legion of experts van Heurck was second 

 to none, whether in knowledge or in kindness. His survivors 

 render a solemn tribute of respect to his memory. 



A micrographer of great excellence, Henri van Heurck was 

 honoured by Governments and by scientific societies. Among 

 the latter the Eoyal Microscopical Society recognised his merits 

 in 1883 by bestowing upon him the title of Honorary Fellow, 

 thereby pronouncing him to be truly eminent in Microscopical 

 Science. 



The following is a list of the most important publications on 

 Microscopy and Diatoms by the late H. van Heurck : — 



Le Microscope, sa construction, son maniement et son application. Paris: 



Delahaye, 1865, 108 pp. Op. cit., 2nd ed., Anvers, 1868, 223 pp. ; 



3rd ed., Bruxelles, 1878, E. Kamlot, 346 pp., 12 pi. and 170 figs. ; 4th ed., 



Anvers, 1891; English translation, London, 1893. 

 Synopsis des DiatomeL'S de Belgique, avec Atlas de 141 pis. Anvers, 1880-5. 

 Note sur les objectit's a immersion homogene. Formules de nouveaux liquides 



propres a cette immersion. Bull. Soc. Belg. Micr., viii. (1881-82) pp. 



xxii.-xxxi. 

 Types du Synopsis des Diatoim'es de Belgique. [Collection of 550 prepara- 

 tions of Diatoms, with Notes by A. Grunow, beginning from the year 



1884 and continued in the lollowing years] 

 Le genre Surirella par M. Julien Deby, travail posthume txaduit, mis en ordre 



et public: par le Dr. Henri van Heurck. Bull. Soc. Beige Micr., xxii. 



(1896) pp. 147-77. 

 Treatise on the Diatomacea;. Translated by W. E. Baxter. London : Wesley, 



1896. 

 Etude sur les objectifs apochromatiques. Ann. Soc. Beige Micr., xxiii. (1898) 



pp. 41-73 (1 pi.). 

 Les Mediums a haute indice. Ann. Soc. Beige Micr., xxviii. (1907) pp. 56-63. 

 Traite des Diatomces. Anvers : J. E. Buschmann, 1899. (8 pis.). 



