TIME IN EVOLUTION—ZEUNER 259 
not be taken as final results. For the time being the material is 
still too scanty to make generalizations sufficiently safe. Some of 
the time rates, however, have been found by several workers inde- 
pendently, and some of the rules—if one be allowed to use this term— 
have been deduced by more than one worker. 
BIBLIOGRAPHY 
GoLpscHMIpT, R. 
1940. The material basis of evolution. 436 pp. New Haven. 
ScHINDEWOLF, O. H. 
1947. Fragen der Abstammungslehre. Aufs. Reden Senckenb. Nat. Ges., 
Frankfurt a M., vol. 1. 23 pp. 
Simpson, G. G. 
1944. Tempo and mode in evolution. 237 pp. New York. 
SMALL, J. 
1946. Quantitative evolution—VIII. Proc. Roy. Irish Acad., ser. B, vol. 
51, No. 4, pp. 53-80. 
1948a. Quantitative evolution—IX—XIII. Proc. Roy. Irish Acad., ser. B, 
vol. 51, Nos. 17-21, pp. 261-346. 
1948b. Some laws of organic evolution. 15 pp. Privately printed. 
ZHUNER, F. E. 
1946a. Biologicai evolution and time. Ch. XII in Dating the Past. London. 
1946b. Time and the biologist. Discovery, vol. 7, No. 8, pp. 242-249, 256. 
(Some diagrams shown in the discourse are figured in this article, 
and acknowledgments are due to the editor of Discovery for per- 
mitting their reproduction.) 
