The liver, heart and kidneys of 32 hybrids of different generations between the European bison and domestic cattle were subjected to a biometric analysis and the results obtained were compared with data for the initial forms. Despite a great difference in body weight (80%) F x males have a relatively lighter liver, heart and kidneys than females. In Bj males the weight of the heart in relation to that of body is larger and the weights of the liver and kidneys smaller than in females. The liver and heart of both sexes of F t hybrids and the kidneys of males are heavier in relation to body weight than they are in the two initial forms. In the Bj generation the liver and heart also have a higher relative weight than they have in the European bison and cattle, but the differences are smaller than in the case of F x hybrids except the relative weight of the liver in B x females. As regards the build of these internal organs, the European bison characters are dominant in the liver (thickness, backwardness of the left lobe as compared with the size of the right and quadrate lobes) and in the number of the renal lobes. The dominance of the cattle characters was found in the size of the caudate process of the liver in the F t hybrids, the higher weight of the left kidney compared with the right one in hybrids of both sexes,, and the greater relative weights of the heart and liver in females than in males. The morphological characters typical of the hybrids, such as the icicle-shaped heart, are also observed. As the share of cattle blood increases in backcross hybrids, their internal organs show more similarity to those of the cattle.

Beobachtungen über den Rumpfabschnitt der Wirbelsäule des Elches-A lces alces L. Obserwacje nad tułowiowym odcinkiem kręgosłupa łosia-Alces alces L.

Use of an appropriately adapted garden spray to inject fixative fluid, the composition of which is given in the study, permits of eliminating difficulties encountered in fixing the carcasses of large mammals. Fixed whole carcasses can be used for macroscopic investigations for a long period. The position, shape and colour of internal organs changes very little, which facilitates preparation and permits of obtaining good photographs. Histological preparations made from sections taken several months after the animal's death stain in a typical way and make it possible to trace the structure or organs. The fixation of material intended for anatomical research is a very old problem.