156 SOME AMERICAN MEDICAL BOTANISTS 



pared sets for sale and accumulated a large 

 herbarium." 



In 1838 the President of the United States ap- 

 pointed Dr. Riddell melter and refiner for New 

 Orleans, in recognition of the creditable work 

 performed in a scientific exploration conducted 

 in Texas; he held this office until 1849. In 1844 

 he w r as one of a commission recommended by the 

 governor and legislature to devise a means for 

 protecting New Orleans from overflow, and 

 about this period he became devoted to micros- 

 copy and invented the binocular microscope. 

 (Ency. Brit, vol. xvi, ninth edition.) 



He it was who advocated the organic nature 

 of miasm and contagion as early as 1836, and 

 later made extensive investigations concerning 

 the microscopic characteristics of the blood in 

 cholera and yellow fever. 



Daniel Drake and his followers. Otto Juettner. 

 N. Orleans Med. & Surg. Jour., vol. xix, 1866-1867. 

 Personal Communications. 



