THE BOTANISTS OF PHILADELPHIA. 93 



Halle, continuing here for six years. He entered the 

 University in 1769, but remained in attendance only about 

 a year. He returned to Pennsylvania in 1770, was ordained 

 by the synod of his church, and assisted his father in 

 pastoral work. In 1774 he was called to a charge in Phila- 

 delphia, and later, in 1780, to be pastor of the Lutheran 

 Church at Lancaster, where he spent the rest of his life. 

 Mr. Muhlenberg wedded, in 1774, Catherine, daughter of 

 Philip Hall, of Philadelphia. He had two sons; one of 

 them, Henry Augustus won a high, reputation as clergyman, 

 and afterward as a man of public affairs. The other son, 

 Frederick Augustus, became a physician at Lancaster, Pa. 



His work in botany began during his sojourn in the 

 country following his flight from Philadelphia. He pur- 

 sued the science earnestly after his return to the city, and 

 became intensely interested in the less conspicuous flowering 

 plants and cryptogams. 



It was not long before Muhlenberg entered into corres- 

 pondence with other botanists. Dr. Johann David Schopf, 

 a Hessian, stationed in New York during the Revolutionary 

 War, who traveled through the Eastern states to Florida, 

 after the conclusion of peace, in search of medicinal plants, 

 became acquainted with Muhlenberg, and was aided by 

 him. After his return to Germany he was the occasion of 

 a correspondence between Muhlenberg and Prof. Schreber, 

 of Erlangen. Later, Muhlenberg corresponded with other 

 eminent botanists in Germany, England, France and 

 Sweden, as well as with Americans. 



Like a true naturalist, Muhlenberg exercised the 

 greatest care and thoroughness in observation and research. 



