Show blood in four Cite categories gorles the blood of human beings Is typed in tour four different categories generally ie represented presented by the first four roman numerals experimentation in blood transfusion years ago brought out that bloods of different species of animals wire were incompatible and that a similar incompatibility existed dinall in all races of men between bloods of different india individuals idu of the four main types ol 01 blood often referred to as blood groups so tar far as Is definitely knowd no one type is any better than another says the united slates put lie health service i 1 |