HYDROBIOLOGY
N. A. Petrova. On the phytoplankton of the north-western bays of Ladoga Lake — 558

MICROBIOLOGY
T. B. Kazanskaia. The effect of soya-bean oil and of its components upon the production of streptomycin — 561

ZOOLOGY
S. A. Miley-kovsky. Lunar periodicity in the spawning in littoral and upper sublittoral invertebrates of the White Sea and of other seas — 564

EVOLUTIONAL MORPHOLOGY
L. S. Glikman. On the rate of evolution of lamnoid sharks — 568

PARASITOLOGY
M. A. Malevitskaia. On the importation of Bothriocephalus gowkongensis Yen, 1955, a parasite possessing a complex development cycle, in the course of acclimatization of fishes from the Amur River — 572

CORRECTIONS

In our article published in DAN, vol. 120, no. 1, 1958 (G. S. Vozdvizhenskii, G. A. Gorbachuk, and G. P. Dezider’ev, “On the question of the mechanism of electrolytic polishing of metals and the structure of the electropolished surface”):

G. S. Vozdvizhenskii
G. A. Gorbachuk
G. P. Dezider’ev

In the article by M. I. Batuev, A. A. Akhrem, A. D. Matveeva, A. V. Kamernitskii, and I. N. Nazarov, “Optical investigation of the conformations of certain gem-substituted cyclohexanes,” published in DAN, vol. 120, no. 4, 1958, at the end of the article, after the formula, the following should be read: Does not acetylate under these conditions; more prone to dehydration.

In the article by I. N. Nazarov and A. A. Akhrem, “Introduction of deoxycarbonyl, glycerol, and hydroxyacetone side chains into ortho-methylcyclohexanone and the stereochemistry of the compounds thereby formed,” published in DAN, vol. 120, no. 5, 1958, on p. 1047, line 5 after the upper cliché, the following should be read: …with the formation of triol XIX with m.p. 88–88.5°, which was…