“…The material was divided into 4 age groups: newborns (including fullterm foetus), calves, young bisons and adult individuals. The observations were carried out mostly on the material fixed by the method of intraarterial injections (Pilarski et al, 1967). The measurements were based on the principles employed for the cattle liver (Eichel, 1925) and utilized fixed material, whi e the data on the weight of the organ concerned fresh material.…”