The book "Some Thoughts on Marriage. With Appendices" was written by Mary Astell - an English writer, feminist and philosopher of the 17th century. In this work, the author examines the issues of marriage, gender relations, and women's autonomy. She shares her thoughts on the terms of marriage, equality between men and women, and the importance of women being able to choose their own destiny. Mary Astell's book is an important work that defined the development of feminism and discussions about the role of women in society.