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heat was required. From 1838 onwards Dr. Apjohn devoted less 

 attention to physical work than to mineralogical chemistry, He was 

 a frequent contributor to the literature of the latter subject. In 

 1838 he analysed and described a mineral from Algoa Bay, South 

 Africa, which proved to be a somewhat effloresced manganese alum, 

 which has since been named " Apjohnite," In 1840 he described a 

 mineral found at Kilbricken, co. Clare, which is closely related to 

 geocronite, but is non -arsenical. Again, in 1852 he was concerned in 

 the description, under the name of " Jellettite," of a yellowish- green 

 garnet found near Zermatt, Monte Rosa, by Dr. Jellett, the present 

 Provost of Trinity College. Papers on the relations of pyrope. of 

 pennine, and on Mexican hyalite are also to be found amongst his 

 contributions to mineralogy. 



Dr. Apjohn contributed to the " Cyclopaedia of Practical Medicine" 

 the articles on electricity, galvanism, toxicology, and spontaneous 

 combustion, and it is stated that the latter article supplied Dickens 

 with the facts on which he founded his account of Krook's death in 

 " Bleak House." 



As the representative of the University of Dublin in the General 

 Medical Council, Dr. Apjohn took a prominent part in the production 

 of the "British Pharmacopoeia." Almost every chemical process and 

 test described in the first edition of the "Pharmacopoeia" was care- 

 fully examined in the Trinity College Laboratory, and much of the 

 success of the work was due to Apjohn's laborious revision in detail. 



He was elected to the Fellowship of the Royal Society in 1853 ; he 

 was a Vice-President of the Royal Irish Academy ; and at the time 

 of his death was second on the roll of Fellows of the King and 

 Queen's College of Physicians. 



Dr. Apjohn was widely esteemed throughout his long life as a 

 thorough and earnest worker, a singularly lucid and able lecturer, 

 and an upright and honourable man. 



J. E. R. 



