""Elements of Ornithology"" is a comprehensive textbook written by William Samuel Waithman Ruschenberger and published in 1845. The book is designed for use in schools and colleges, and it provides a detailed overview of the study of birds, also known as ornithology. The book is divided into three main sections: the first section covers the general anatomy and physiology of birds, including their skeletal structure, feathers, and digestive system...