In writing, teaching and public speaking, Beale was a leading proponent of the
scientific method in medicine. He was a strong advocate of the value of microscopy, which he felt to be essential to understanding morbid growths and diseases. In his 1854 book
The Microscope in its Applications to Practical Medicine, Beale described the cell as a perfectly closed sac containing a
nucleus, which in turn usually contained a clear bright spot, the
nucleolus. He classified cells by shape as well as by the part of the body they came from, and discussed ways in which cancerous cells could be distinguished from benign changes with similar clinical appearance. In 1860 he found and described cancer cells in
sputum. Beale pioneered differential staining. From observing the differences in the way in which active, living organisms responded to staining compared with nonliving organisms, he concluded that the nucleus must hold the "bioplasm", or the essence of life. He was a passionate and vocal advocate of the view that there is an essential difference between living and inert matter. He felt that there were reasons to doubt the evidence for human evolution. Beale has been described as a "staunch
vitalist". He believed in a "vital force", saying, He said, ==Publications==