D. S. Steinberg, V. A. Koroteev. On the possible application of the refraction index of artificial glasses to an approximate definition of the chemical properties of effusive rocks of the Urals . . . . . . . . 934

CYTOLOGY

N. S. Stroganova, M. A. Monakhova. The formation of mitochondria from the cell-wall in spermatogonia of the grain mite . . . . . . . . 937

HISTOLOGY

N. F. Kastrikin. A histochemical analysis of Mug effect involved in Homori’s cobalt method on alkaline phosphatase . . . . . . . . 940

BIOCHEMISTRY

N. S. Geiko, V. I. Liubimov, W. L. Kretovich. Free ketoncids in Azotobacter vinelandii . . . . . . . . 944

V. V. Dergachev, E. M. Leikina, K. K. Antipova. The effect of aminopterine on the concentration of nucleic acids in the myocardium in the case of a compensatory hyperfunction of the heart . . . . . . . . 946

M. S. Kritskii, I. S. Kulaev, L. M. Klebanova, A. N. Beloserskii. On the two ways of phosphate transportation in plant bodies of Agaricus bisporus . . . . . . . . 949

S. E. Severin, L. A. Tsetlin, V. I. Telepneva. The fermentative synthesis of NAD from NMN and ATP in isolated nuclei of the heart, skeletal muscle and liver of rabbits . . . . . . . . 953

PLANT PHYSIOLOGY

I. I. Gunar, A. M. Siniukhin, I. A. Ozolina. Action potential of cells of Nitella flexilis, filled up with artificial saline solutions . . . . . . . . 956

G. P. Kugatova-Shemiakina, V. A. Rudenko, G. P. Smirnova, A. I. Grechu-shnikov, L. M. Mishurovskaia, D. A. Agakishiev, L. A. Pen’kov, V. F. Ushakova. New growth-stimulating substances . . . . . . . . 960

PHYTOPATHOLOGY

L. V. Metlitskii, O. L. Ozeretskovskaia, G. I. Chalenko, G. A. Strokova. The antifungal effect of phenolic compounds, formed in potato-tubers as a result of injuries . . . . . . . . 964

EXPERIMENTAL MORPHOLOGY

G. V. Khomullo. Regeneration of osseous tissue under the influence of phenamine and barbamyl . . . . . . . . 968

PHYSIOLOGY

V. G. Screbitskii, L. L. Voronin. Inhibition of induced activity of neurons of the optic zone during the action of sound stimulus . . . . . . . . 972

CORRECTION

In my article (R. A. Kordzadze, “Basic Theorems for Singular Integral Equations with Shift”), published in DAN, vol. 154, No. 6, 1964, the form of the operator was omitted.

In formula (4.2) one should put

\[ D(t_0,t)(\,)\equiv G(t_0)(\,)+\frac{1}{\pi i}\int_{\Gamma}\frac{K(t_0,t)(\,)\,dt}{t-t_0}. \]

R. A. Kordzadze

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