[Form of branching of pulmonary air pathways in the canine lung]. / Forma razvetvleniia vozdukhonosnykh putei legkogo sobaki.

The degree of regularity in bronchial dichotomy has been studied in 5 corrosive preparations of the dog bronchial tree by the method of E. R. Weibel. It has been demonstrated that a high degree of regularity is specific for the dog lungs that makes 0.82 +/- 0.12 regarding small and large diameters. Approximation in distribution of bronchi having the diameter of 3--3.5 mm in 1--9 generations by means of binomial distribution gives a good result. The greatest bronchial rate with the diameter mentioned above has been registered in 5--7 generations. Theoretical data are presented to demonstrate the necessity in regularity of bronchial branching in order to maintain an optimal gaseous exchange in lungs.

[Senile changes in the intraorganic lymphatic bed of human facial skin]. / Starcheskie izmeneniia vnutriorgannogo limfaticheskogo rusla kozhi litsa cheloveka

The alterations in the intraorganic lymphatic bed of the skin of human cheeks, lips, the red edge included, were studied macro-microscopically in cleared preparations with preliminary injection taken from human corpses of either sex from 55 to 89 years of age. Considerable atrophic processes were established to take place in the lymphatic bed of the face skin after 55 years of age. The superficial lymph capillary network can not be detected completely by the age of 70. The reduction of the profound capillary network and intraorganic lymph vessels proceeds. Diverticula of various shape make their appearance on the rest of lymph capillaries and vessels, the contours of the lymph capillaries and vessels undergo considerable changes.