Haemataulics – study of movement of blood through blood vessels Hagiology – study of saints Halieutics – study of fishing Hamartiology – study of sin Harmonics – study of musical acoustics Hedonics – part of ethics or psychology dealing with pleasure Helcology – study of ulcers Heliology – science of the sun Helioseismology – study of sun's interior by observing its surface oscillations Helminthology – study of worms Hematology – study of blood Heortology – study of religious feasts Hepatology – study of liver Heraldry – study of coats of arms Heresiology – study of heresies Herpetology – study of reptiles and amphibians Hierology – science of sacred matters Hippiatrics – study of diseases of horses Hippology – study of horses Histology – study of the tissues of organisms Histopathology – study of changes in tissue due to disease Historiography – study of writing history Historiology – study of history Homiletics – art of preaching Hoplology – study of weapons Horography – art of constructing sundials or clocks Horology – science of time measurement Horticulture – study of gardening Hydrobiology – study of aquatic organisms Hydrodynamics – study of movement in liquids Hydrogeology – study of ground water Hydrography – study of investigating bodies of water Hydrokinetics – study of motion of fluids Hydrology – study of water resources Hydrometeorology – study of atmospheric moisture Hydropathy – study of treating diseases with water Hyetology – science of rainfall Hygiastics – science of health and hygiene Hygienics – study of sanitation; health Hygiology – hygienics; study of cleanliness Hygroscopy – study of humidity Hygrometry – science of humidity Hymnography – study of writing hymns Hymnology – study of hymns Hypnology – study of sleep; study of hypnosis Hypsography – science of measuring heights