The book has no illustrations or index. It may have numerous typos or missing text. However, purchasers can download a free scanned copy of the original rare book from the publisher's website (GeneralBooksClub.com). You can also preview excerpts of the book there. Purchasers are also entitled to a free trial membership in the General Books Club where they can select from more than a million books without charge. Original Publisher: Ithaca, New York, Comstock Publishing Co.; Publication date: 1937; Subjects: Freshwater biology; Freshwater organisms; Fresh-water biology; Nature / Lakes