The book may have numerous typos or missing text. It is not illustrated or indexed. However, purchasers can download a free scanned copy of the original rare book from the publisher's website. You can also preview the book there.Purchasers are also entitled to a trial membership in the publisher's book club where they can select from more than a million books for free.Original Publisher: Published by the Carnegie Institution of Washington Publication date: 1904Subjects: Physiology, Comparative; Infusoria; Amoeba; Irritability; Invertebrates; Protozoa; Human behavior; Psychology / General; Science / Life Sciences / Biology / Microbiology; Science / Life Sciences / Anatomy