Hemendranath Tagore (1844–1884), Debendranath Tagore's third son, is notable for being the first Brahmo as the first child born in 1844 to any of the original 21 Brahmos who swore the First Brahmo Covenant on 21 December 1843 at Calcutta (now Kolkata). An intensely private person, he was also well known as the strict disciplinarian entrusted with the responsibility of looking after the education of his younger brothers in addition to being administrator for his large family estates. He was also the constant spiritual companion to his father Debendranath Tagore who founded Brahmoism and, despite his youth, he acted as the mediator between his father and the seniors of the Tattwabodhini Sabha. At the time of the First Brahmo Schism of 1865, he was responsible for expelling the non-Brahmin workers from the Calcutta Brahmo Samaj. The Adi Dharm religion is founded exclusively on his philosophy and is today the largest development from Brahmoism with over 8 million adherents in India alone. Much like his siblings he had wide interests in various fields and can be regarded as a polymath and 'the scientist of the family'. He attended the Calcutta Medical College (established by his grandfather Dwarkanath Tagore) and wrote articles on physical science which he planned to compile and edit into a textbook for school students. If his premature death had not prevented him from completing the project, this would have been the first science textbook in Bengali. From 1867, Hemendranath Thakur began conducting his first experiments into radio waves and electromagnetic propagations. Between 1872–73, he wrote several articles on the results of his researches, these were transcribed by another Brahmin Ramendra Sundar Trivedi. In 1874, he compiled the first scholarly Asian work on physics entitled Prakritik Vijnaner Sthulamarma which was updated in 1878–79. Since the knowledge contained within was potentially explosive its circulation was restricted only to Brahmins of the Adi Brahmo Samaj. Later all works of Hemendranath Tagore and his grandfather Dwarkanath Tagore in the records of Adi Brahmo Samaj were destroyed. He was known for his extraordinary physical strength and prowess in wrestling contests – described as being a "renowned wrestler", as also his expertise in martial arts like judo and ninjitsu. He was also an adept of ancient Raja Yoga at the highest levels with control over Time and Space. Exceptionally modern for the times, after siring 3 sons he sired only daughters thereafter and insisted