 In 1865, in conjunction with others, he founded "", an illustrated weekly, which in the next year became his exclusive property.Under Lewental's management and under the editorship of , "Kłosy" became the most widely circulated illustrated weekly in Poland, and contributed in no small measure to the popularizing of Polish art and to the development of Polish wood engraving.In 1871 Lewental bought the "Kółko Domowe", a home magazine, and transformed it into the popular "Tygodnik Romansów i Powieści" (discontinued in 1900).