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His death has left a great void in English Pharmaceutics, as no one 

 in England had a greater amount of knowledge on that subject. 

 As a lecturer, he secured the attention of his class by an earnestness 

 of purpose, aptness of experimental illustration, and the practical 

 bearing of his remarks. 



Early in the year 1832 he resigned his office at the General 

 Dispensary, and on this occasion a silver salver was presented to him 

 by the Governors of that Institution, as a memento of their regard 

 and esteem. In the following September he married, and establish- 

 ed himself in general practice in Aldersgate Street. 



In the winter of 1832 he became Professor of Materia Medica in 

 the New Medical School in Aldersgate Street ; and at the same 

 period succeeded Dr. Gordon as Lecturer on Chemistry at the Lon- 

 don Hospital. 



His connexion with the London Hospital procured him the oppor- 

 tunity of being appointed Physician to that extensive institution. 

 In 1841 he procured the licence to practise in London from the Col- 

 lege of Physicians. He was elected a Fellow of that body in 1845. 

 On the establishment of the London University, he was appointed 

 Examiner in Materia Medica and Pharmacy, — a position which he 

 held till his death. He took great interest in the establishment of 

 the Pharmaceutical Society, and delivered lectures on Materia 

 Medica in connexion with that body. 



Dr. Pereira was the distinguished and highest representative of 

 that science which involves the history, properties, and uses of drugs, 

 better known on the Continent than in England by its name of 

 Pharmacology. At the recent meeting of the Association for the 

 Advancement of Science at Wiesbaden, there was a Pharmacological 

 Section specially devoted to the subject, attended by upwards of 

 two hundred members. ' The Elements of Materia Medica and 

 Therapeutics,' to which Dr. Pereira gave the best years of his life, 

 is considered to be one of the most elaborate and thoroughly worked - 

 out productions of modern science. Compared with similar phar- 

 maceutical works of France and Germany, it is remarkable for its 

 diversity of character, excelling greatly in the amount of commer- 

 cial and other practical information, in the preciseness and value of 

 its notes, and in the scrupulous exactness with which its statements 

 are authenticated by references to their original source. Where 

 obscurity attached to any statement, the author was careful to 

 express it with a mark of doubt. As a painstaking and conscien- 

 tious writer Dr. Pereira was unsurpassed, and his work contains 

 nothing that may not be thoroughly relied on for its accuracy. He 

 also added largely to the botany of pharmacy. 



Dr. Pereira had the happiness of enjoying during his life, large 

 honours, and there is little doubt, had he been spared, he would have 

 reaped the mure substantial rewards of a lucrative practice. 



He was elected a Fellow of the Royal Society in 1838, and was 

 chosen on the Council in 1842-44. He was also a Fellow of the 

 Linnean and other Scientific Societies, and was in constant commu- 

 nication with the learned of all countries. 



