Lovisin, Gyllenstierna, Dufva and Tamm. Liljevalch did however became the first to actually settle there permanently. He took an active part in the daily activities on the farm, and aspired that Saltskog gård would serve as a textbook example of ideal farming. He undertook extensive renovations of the farm and the estates to make them a cultural centre filled with art. An extension was made to the main building; and a smaller villa was added, together with a barn, stables and outhouses. The garden contains several unusual species of trees and is designed as an English landscape garden. Two new commemorative rune stones were carved. Today, the manor is run by a non-profit association. They have restored much of the premises in their original condition. There are several artist studios and exhibition halls. Concerts, lectures and exhibitions are held all year round. During the summer season, theatre is also performed in the gardens. (English: The Museum of Biology) was donated to the city by patron Carl Fredrik Liljevalch. The building is in Art Nouveau style, and located on Erik Dahlbergs road. It opened to the public in 1913, thus making it the oldest museum in the city. The exhibitions were created by Gustaf Kolthoff and his son Kjell Kolthoff, and show animals and birds from the province of Sörmland (where Södertälje is located) in their natural environments. In total, there are over 100 different species on display. Kjell Kolthoff painted the large dioramas that have remained to this day. The museum was completely renovated and reopened in 1983. The world's oldest propeller-driven steamship which still has its original engine is S/S Ejdern. It was originally built by Götaverken in Gothenburg in 1880. During its first years, Ejdern operated in the Gothenburg archipelago, Lake Roxen, and several ports in central Sweden. Since 1906, it has had its home port in Södertälje. The first route from the port in Södertälje was to Mörkö , and cargo hauls in eastern Lake Mälaren . Between 1914 and 1957, the boat had one single owner, Rickard Fredmark. He sold the boat to the City of Södertälje. At that time, the ship was unprofitable and in very poor condition. The city subsequently decided that the boat was to be scrapped. In 1964 the boat was donated to an association for the preservation of old boats. Enthusiasts of this particular vessel broke out and formed (English: The