GENETICS

O. M. Gavrilova. Fertilization process in Mirabilis jalapa as dependent on pollen amount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1445

ECOLOGY

I. A. Neifeldt. The indian cuckoo (Cuculus M. micropterus Gould)—a nest parasite of Lanius cristatus confusus Stegm. . . . . . . . . . . . . . . . . . . . . . . . . . 1447

BIOPHYSICS

I. A. Chalisov, L. B. Berlin. Restoration processes in the mucous membrane of the duodenum following to radiation injury . . . . . . . . . . . . . . . . . . . . . . 1451

BIOCHEMISTRY

N. D. Gabrielian, M. A. Novikova, G. L. Zhdanov. The capacity of uridindiphosphateglucose to take part in saccharose of the biosynthesis . . . . . . . . . 1454

PLANT PHYSIOLOGY

G. I. Makhonina, P. I. Iushkov, M. J. Volkova, N. V. Timofeev-Resovskii. The distribution of Sr⁹⁰ and Ru¹⁰⁶ in the basal organs of the pine tree . . . . . . 1457

ZOOLOGY

E. A. Bogdanova. Division process in Trichodina truttae Muller (Infusoria, Peritricha) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1459

PHYSIOLOGY

T. D. Dzhavrishvili. The electric activity of isolated neurons of the somatosensorial cortex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1463

EMBRYOLOGY

G. M. Ignatieva. A comparison of the dynamics of the invagination process of chordomesoderma material in embryos of Acipenser chypa, A. Güldenstaedtii and Amblystoma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1467

PARASITOLOGY

Iu. S. Balashov. Destruction of erythrocytes of vertebrates in the digestive tube of blood-sucking arthropods . . . . . . . . . . . . . . . . . . . . . . . . . 1471

I. G. Skutar. A study of the development cycle of the cestoid Raillietina (Skrjabinia) fedjushini Skutar, 1963—a parasite of domestic poultry . . . . 1475

A. V. Uspenskaia. Hyaluronidase at different stages of the life cycle of Ichthyophthirium multifiliis . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1477

CORRECTIONS

In the article by E. V. Kukharskaya, Yu. I. Skorik, N. G. Boiko, “Organic Derivatives of Kaolin,” published in DAN, vol. 148, no. 2, in the caption to Fig. 1 the line should read: IV—phenylmethylene derivative; reference standard—initial kaolin.

In my note (B. S. Pavlov, “On the Spectral Theory of Non-Self-Adjoint Differential Operators”), published in DAN, vol. 146, no. 6, 1962, an omission was made in a formula. On page 1267, line 15 from the bottom, it is printed

\[ \int_0^\infty |q(x)|x^{n+1}\,dx < \infty, \]

whereas it should be

\[ C_n=\int_0^\infty |q(x)|x^{n+1}\,dx < \infty. \]

This inaccuracy was pointed out by M. Gasymov (RZhMat., 1963, 4Б 381).

B. Pavlov

In the article by E. A. Volkov, “On Methods of Refinement by Differences of Higher Orders and \(h^2\)-Extrapolation,” published in DAN, vol. 150, no. 3, 1963, on p. 456, line 22, the following should be read:

Lemma 1. If \(f \in C_{2m,\lambda}(\overline{R})^*\), \(\nu_j\varphi_j \in C_{2m+2,\lambda}(\Gamma_j)\), \(\bar{\nu}_j\psi_j \in C_{2m+1,\lambda}(\Gamma_j)\),

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