=Blood Heritage.--=To this phenomenon of resemblance in successive generations based on ancestry the term heredity is applied. In man, for instance, there is a marked tendency toward the reappearance in offspring of structures, habits, features, and even personal mannerisms, minute physical defects, and intimate mental peculiarities like those possessed by their parents or more remote forebears. These personal characteristics based on descent from a common source are what we may call the blood heritage of the child to discriminate it from a wholly different kind of inheritance, namely, the passing on from one generation to the next of such material things as personal property or real estate. =Kind Determined by Origin.--=It is inheritance in the sense of community of origin that determines whether a given living creature shall be man, beast, bird, fish, or what not. A given individual is human because his ancestors were human. In addition to this stock supply of human qualities he has certain well-marked features which we recognize as characteristics of race. That is, if he is of Anglo-Saxon or Italian or Mongolian parentage, naturally his various qualities will be Anglo-Saxon, Italian, or Mongolian. Still further, he has many distinctive features of mind and body that we recognize as family traits and lastly, his personal characteristics such as designate him to us as Tom, Harry, or James must be added. The latter would include such minutiæ as size and shape of ears, nose or hands; complexion; perhaps even certain defects; voice; color of eyes; and a thousand other particulars. Although we designate these manifold items as individual, they are in reality largely more or less duplicates of similar features that occur in one or the other of his progenitors, features which he would not have in their existing form but for the hereditary relation between him and them. "O Damsel Dorothy! Dorothy Q.! Strange is the gift that I owe to you; * * * * * What if a hundred years ago Those close-shut lips had answered 'No,' * * * * * Should I be I, or would it be One-tenth another, to nine-tenths me?" "Soft is the breath of a maiden's yes; Not the light gossamer stirs with less; But never a cable that holds so fast Through all the battles of wave and blast, And never an echo of speech or song That lives in the babbling air so long! There were tones in the voice that whispered then You may hear to-day in a hundred men."