sentence: drawing in ink by kazan watanabe , c. 1826 heinrich bürger ( or : heinrich burger ) ( hamelin , 29 february 1804 , or 7 november 1804 , or 20 january 1806 , - indramayu ( java ) 25 march 1858 ) was by birth a german physicist , biologist and botanist employed by the dutch government , and an entrepreneur .