A Socialist Publishing House owned Co-operatively by Over 1000 Socialist Locals and Individuals
Chicago March 6, 1906.
Prof. Ernst Haeckel,
Jena, Germany,
Dear Sir: –
At the suggestion of Prof. J. Howard Moore we are sending you a complimentary copy of his book „The Universal Kinship“. We should be greatly obliged to you for any comment you may care to send after reading the book.