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He wrote on forms and uses of pores of skin of hands and feet. -
He mentioned about loops and spiral patterns of the fingerprints. He didn't state fingerprints as an individual identification. -
He engraved his fingerprints and used them to ornament three of his books. He was one of the first to recognize the individuality of a finger mark. -
He named nine types of fingerprints. They are called the transverse curves, the central longitudinal stripe, the oblique strives, the oblique loop, the almond whorl, the spiral whorl, the ellipse, the circle, the double whorl. -
he began fingerprinting the natives with whom he had official transactions. He demanded an imprint of signers hand instead of signature to avoid any future repeated trickery. -
He was the first person to suggest the most valuable idea of identifying criminals from fingerprints found at crime scene, which plays in important role in the modern methods of scientific criminal investigations. He also wrote a textbook on fingerprint procedure. -
Published a book on fingerprints in 1892. In this book, he described anatomy of fingerprints and offered practical methods of recording them. -
The first classification system of fingerprints use In India was proposed by him and he published a textbook on ''classification and uses of fingerprints' -
He maintained a file of fingerprint records, which was then the largest of its kind in the world. -
He devised the single fingerprint system of registration which was very simple method, and a special magnifying glass was employed in the technique for classifying each fingerprint.