The book "British Borneo. Sketches of Brunei, Sarawak, Labuan and North Borneo" by Sir William Hood Treacher is a valuable document about the colonial period in Southeast Asia. The author, a British diplomat and administrator, offers the reader a reflection of the culture and life of the local people of Borneo in the second half of the 19th century. In his sketches, Treacher pays attention to architectural monuments, local customs, religious ceremonies and daily life of the native peoples of the island. This book will be a useful resource for those interested in the history and culture of Borneo, as well as for scholars studying colonial influences in the Southeast Asian region.