Hydrogenoid constitution is characterized by the excess of water in the body. They are aggravated by moisture and humidity, prone to dropsy and anasarca , and suffers from tissue growth of benign type. They are slow, fatigued, without life, apathetic, heavy, and indolent. Slow nutrition. Asthmatics, rheumatics, obesity. They belong to the Sycotic group. Ars , Dulc , Nat sulph , Nit acid phytolacca , Rhustox , Thuja , Dig etc. are the main drugs . Oxygenoid constitution is characterized by the accumulation of excess of oxygen with resultant destruction of tissues. Body is thin and thus ill on change of season. Destructive, disorders involving the genitalia and diseases of central nervous system. Body is prone to ulcerations and self –destruction. Numerous white spots on the nails. Generally of syphilitic background. Calc phos , Ferr phos , Nat phos , Phos , Phos acid, Iod , Sil , Calc , Nat mur , Hell, Tuberc , Syph , Merc sol are the main drugs . Carbo – Nitrogenoid constitution is characterized by excess of carbon and nitrogen and suffers from functional disorders of body and mind, diminution of the absorption of oxygen by the tissues. Psora , eczema, arthritism , marked by erratic working or the heart, lungs, kidneys, liver, spleen etc. they are mainly Psoric . Ars , Ars iod , Calc phos , Carbo veg, Hep , Iod , Kali bich , Lach , Lyco , Natr mu, Sulph , Zinc met etc. are the main drugs. Grauvogl’s Classification – In 1870 homeopath Dr. Von Grauvogl classified constitution most of homeopaths accepted this classification.which is as followes -