N. I. Shapiro and N. V. Belitzina. Antibiotics as substances reducing the effect of irradiation on cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 904

BIOCHEMISTRY

G. N. Zaizeva, Li Tsiun In and A. N. Belozersky. An investigation of acid-soluble nucleotides of Azotobacter vinelandii with reference to the culture age and to the nitrogen component of the medium . . . . . . . . . . . . . . . . . . 908

D. F. Sokolov. Biochemical changes taking place in the composition of the organic matter of slash in the process of its decomposition . . . . . . . . . . . . . . 912

PLANT MORPHOLOGY

A. N. Sladkov. On certain fossil spores of Filicales . . . . . . . . . . . . . . . . 916

PLANT EMBRYOLOGY

S. A. Admiral’skaia. Fertilization, embryo and endosperm development in the allopolyploid form of Mentha piperita L. . . . . . . . . . . . . . . . . . 919

PLANT PHYSIOLOGY

P. G. Kosikova. The germination of seeds of certain species of weeds and ruderal plants in the case of gibberellinic acid applied in varying concentrations . . . 922

J. A. Nesterov. The localization of alterations connected with the character of the rest period in the apple tree . . . . . . . . . . . . . . . . . . . . . . . . 925

N. S. Petinov and A. N. Pavlov. On the participation of spikelet glumes of wheat in nitrogen absorption in the case of foliar nutrition . . . . . . . . . . . . . . 929

V. V. Skripchinskii. Peculiarities in the development and cold resistance of certain spring wheats, as related to their photoperiodic reactions . . . . . . . . . 932

EXPERIMENTAL MORPHOLOGY

A. A. Kolosova. Healing of heart wounds in birds . . . . . . . . . . . . . . . . . 936

ENDOCRINOLOGY

A. A. Voitkevich, E. I. Zubkova and I. I. Grigorieva. The effect of temperature on the neurosecretion taking place in the preoptic nucleus of the frog . . . 940

PARASITOLOGY

G. A. Kotel’nikov. The development cycle of the cestode Fimbriaria amurensis nov. sp.—a parasite of domestic ducks . . . . . . . . . . . . . . . . . . . . . 944

V. I. Petrochenko. The interpretation of the development cycle of a tapeworm of geese, Drepanidotaenia przewalskii Skrjabin, 1914 . . . . . . . . . . . . . 946

N. N. Shevchenko and G. I. Vergun. The interpretation of the development cycle of the trematode Astiotrema monticelli Stossich, 1904 . . . . . . . . . . . 949

CORRECTIONS

In the article by N. P. Korneichuk, “On the Approximation of Periodic Functions Satisfying a Lipschitz Condition by Bernstein–Rogozinskii Sums,” published in DAN, vol. 125, no. 2, 1959, formula (11) should read

\[ \mathcal{E}_n(a,\beta) \le \frac{1}{(n+1)^\alpha} \left\{ \left(\frac{\pi}{2}+\varepsilon_n\right)a+ \left(\frac{1}{2}+\frac{1}{\pi}\operatorname{si}\pi\right)(1-a) \right\} + \frac{\alpha c_n}{(n+1)^{\alpha+1}}. \tag{11} \]

In my article, published in DAN, vol. 126, no. 3, 1959 (M. I. Kiselev, “On the Calculation of Shock Waves in Magnetohydrodynamics”), the factor \((k+1)\) was omitted before the last term of equation (6). It should read:

\[ -(k+1)V_{1x}^{2} h_{1y} p_1 \left(1-\frac{u_{1x}^{2}}{V_{1x}^{2}}\right)=0. \]

M. I. Kiselev

T-00242. Signed for printing 23 January 1960. Print run 5100 copies. Order 2466.
Paper size \(70\times108^{1}/_{16}\). Paper sheets 7½. Printed sheets 20.55 + 5 inserts. Publisher’s sheets 22.4.
2nd Printing House of the Publishing House of the Academy of Sciences of the USSR. Moscow, Shubinskii Lane, 10.