The text discusses two books on the anatomy of the rat and the hawfinch. "Anatomy of the Rat" by Eunice Chace Greene is an atlas and textbook that provides a comprehensive account of the rat's anatomy. It was first published in 1935 and has been reprinted, though it has some minor flaws. The book lacks detailed information on the brain, which is important due to the work of experimental neurologists. "The Genesis of the Rat Skeleton" by Donald G. Walker and Zolton T. Wirtschaft is an attempt to depict the development of ossification centers using radiographs and photographs. It adds little new information to previous works. The book has an elegant format but the radiographs and photographs are not satisfactory. The portrayal of ossification centers in the skull is inadequate, and the absence of an anatomical text is a serious objection. The book "The Hawfinch" by Guy Mountfort is a detailed study of the hawfinch, a bird with a large bill and powerful jaw muscles. It describes the bird's habits, including its ability to crack cherry stones and olive kernels, and its strong flying abilities. The hawfinch is also described in terms of its plumage, behavior, and nesting habits. The book includes an appendix on flight and a bibliography of 650 titles, though it could not be fully included due to publication costs. The text highlights the value of focusing on a single species to understand its life in detail.The text discusses two books on the anatomy of the rat and the hawfinch. "Anatomy of the Rat" by Eunice Chace Greene is an atlas and textbook that provides a comprehensive account of the rat's anatomy. It was first published in 1935 and has been reprinted, though it has some minor flaws. The book lacks detailed information on the brain, which is important due to the work of experimental neurologists. "The Genesis of the Rat Skeleton" by Donald G. Walker and Zolton T. Wirtschaft is an attempt to depict the development of ossification centers using radiographs and photographs. It adds little new information to previous works. The book has an elegant format but the radiographs and photographs are not satisfactory. The portrayal of ossification centers in the skull is inadequate, and the absence of an anatomical text is a serious objection. The book "The Hawfinch" by Guy Mountfort is a detailed study of the hawfinch, a bird with a large bill and powerful jaw muscles. It describes the bird's habits, including its ability to crack cherry stones and olive kernels, and its strong flying abilities. The hawfinch is also described in terms of its plumage, behavior, and nesting habits. The book includes an appendix on flight and a bibliography of 650 titles, though it could not be fully included due to publication costs. The text highlights the value of focusing on a single species to understand its life in detail.