50 SIMPLER ORGANIC SUBSTANCES 



02. (III. 6l). 



03. N. KuDRYAVTSEV. Nejijanoe Khoz., g, 17 (1951)- 



04. P. Kropotkin. In Sovetskaya geologiya, Part 47, p. 104. 



Moscow (Gos. nauch. tekh. Izd. vo Geol. Okhrani 

 Nedr), 1955. 



05. W. Herschel. Quoted by A. Berry. A short history of 



astronomy. London, i8g8. 



06. P. S. Laplace. Exposition clu systeme du monde. Paris, 



1796. 



07. V. Ambartsumyan (Ambartsumian). Trans, int. astr. Un., 



S, 665 (1952). 



08. (II. 13). 



09. J. H. Jeans. Astronomy and cosmogony. Cambridge, 1928. 



10. (IV. 62). 



loa. N. N. Pariiskii. Astron. Zhur., 20, 9 (1943) ; 21, 69 (1944). 



11. I. Kant. Allgemeine Naturgeschichte und Theorie des 



Himmels. Konigsberg, 1755. 



12. C. F. V. Weizsacker. Z. Astrophys., 22, 319 (1944). 



13. D. TER Haar. Rev. mod. Phys., 22, 1 19 (1950). 



14. S. Chandrasekhar. Rev. mod. Phys., 18, 94 (1946) ; hitro- 



duction to the study of stellar structure. Chicago, 



1939- 



15. O. Shmidt. Chetyre lektsii o teorii proiskhozhdeniya Zemli. 



Moscow (Izd. AN SSSR), 1950. 



16. E. Shatsman. In Voprosy kosmogonii (ed. B. V. Kukarkin). 



Vol. 3, p. 227. Moscow (Izd. AN SSSR), 1954. 



17. V. Fesenkov. In Trudy i-go soveshchaniya po voprosam 



kosmogonii, p. 35. Moscow (Izd. AN SSSR), 1951. 



18. B. J. BoK and E. F. Reilly. Astrophys. J., 10^, 255 (1947). 



19. O. Struve. Stellar evolution : an exploration from the 



observatory. Princeton, N.J., 1950. 



120. L. Gurevich and A. Lebedinskii. Izvest. Akad. Nauk 



S.S.S.R. Ser. Fiz., 14, 765 (1950) ; Astron. Zhur., 2'], 

 273 (1950) ; also in Voprosy kosmogonii (ed. B. V. 

 Kukarkin), Vols. 2 and 3. Moscow (Izd. AN SSSR), 



1954- 

 G. Khil'mi. 200 let nauchnoi kosmogonii. Moscow (Izd. 

 * Znanie '), 1955. 



121. W. W. Rubey. Bull. geol. Soc. Amer., 62, WW (^i^^i). 



122. A. Gautier. Ann. Min., Paris, (ser. 10), p^ 316 (1906). 



123. (IV. 92). 



