1018 
Very detailed studies of the flora were made by Mrs. 
E. M. Reid and Miss Chandler [29], from which they 
inferred that the mean temperature was almost cer- 
tainly not below 70F. On the other hand, from a careful 
study of the topography I estimated the probable upper 
limit of the mean temperature as 65F. In all other 
respects the climatic reconstruction agreed closely with 
the inferences from the vegetation, and it seems likely 
that the discrepancy of at least 5F was due to increased 
solar radiation. 
It is only by the multiplication of such studies, both 
in space and time, that the fundamental problem of 
climatic variations can eventually be solved. The prob- 
lem is not entirely academic, for signs are not wanting 
that we are even now in a period of climatic change 
which may have vital, but so far unpredictable, conse- 
quences for civilisation. 
REFERENCES 
A 201-item annotated bibliography has recently been pre- 
pared by the author. See C. H. P. Brooks, ‘‘Selective Annotated 
Bibliography on Climatic Changes.” Meteor. Abstr. & Bibliogr., 
1: 446-475 (1951). 
1. Auztmann, H. W:son, “Glaciological Research on the 
North Atlantic Coasts.”’ R. geogr. Soc., Res. Ser., No. 1 
(1948). 
2. Arupt, T., Handbuch der Palaeogeographie, 2 Bde. Leipzig, 
Gebr. Borntraeger, 1919. 
3. Brapuey, W. H., ‘““‘The Varves and Climate of the Green 
River Epoch.” U. S. Geol. Surv. Prof. Pap. 158 H, pp. 
87-110 (1929). 
4, Brooks, C. E. P., Climate Through the Ages, 2nd (revised) 
ed. London, Benn, 1949. 
5. —— “Continentality and Temperature—Second Paper: 
The Effect of Latitude on the Influence of Continentality 
on Temperature.’ Quart. J. R. meteor. Soc., 44: 253-269 
(1918). 
6. —— ‘‘The Problem of Warm Polar Climates.” Quart. J. R. 
meteor. Soc., 51: 838-91 (1925). 
7. CautunpvAR, G. 8., ‘“The Composition of the Atmosphere 
Through the Ages.” Meteor. Mag.; 74: 33-39 (1939). 
8. Coanry, R. W., ‘Tertiary Forests and Continental His- 
tory.”’ Bull. geol. Soc. Amer., 51: 469-488 (1940). 
9. Dacqut, H., Grundlagen und Methoden der Palaeogeog- 
raphie. Jena, G. Fischer, 1915. (See pp. 432, 449) 
10. Ficxer, H. v., “Die eiszeitliche Vergletscherung der nord- 
westlichen Pamirgebiete.” S. B. prewss. Akad. Wiss., 
Mat.-Nat. Kl., SS. 61-86 (1938). 
11. Fuint, R. F., Glacial Geology and the Pleistocene Epoch. 
New York, Wiley; London, Chapman, 1947. 
12. Hansen, H. P., ‘‘Post-glacial Forest Succession, Climate 
and Chronology in the Pacific North-West.”? Trans. 
Amer. phil. Soc., 37: 1-130 (1947). 
13. Hoye, F., and Lyrrieton, R. A., “‘The Effect of Inter- 
stellar Matter on Climatic Variation.”’ Proc. Camb. phil. 
Soc., 35: 405-415 (1989). 
14. Humpnreys, W. J., ‘Volcanic Dust and Other Factors in 
the Production of Climatic Changes, and Their Possible 
Relation to Ice Ages.’”’ Bull. Mt. Weather Obs., 6: 1-34 
(1913). 
15. 
16. 
17. 
18. 
19. 
20. 
21. 
22. 
23. 
24, 
25. 
26. 
27. 
28. 
29. 
30. 
31. 
32. 
33. 
34. 
35. 
36. 
CLIMATOLOGY 
Huntineton, H., and Visaer, 8. S., Climatic Changes, 
Their Nature and Cause. New Haven, Yale University 
Press, 1922. 
JerrrEys, H., The Earth, Its Origin, History and Physical 
Constitution, 2nd ed. Cambridge, University Press, 1929. 
(See p. 144) 
Kerner—Marinaun, F., “Das akryogene Seeklima und 
seine Bedeutung fiir die geologischen Probleme der 
Arktis.”” S. B. Akad. Wiss. Wien., Abt. Ila, 131: 153-185 
(1922). 
— Paléoklimatologie. Berlin, Gebr. Borntraeger, 1930. 
(See pp. 455-464) 
Koppen, W., und Wrecener, A., Die Klimate der geolo- 
gischen Vorzett. Berlin, Gebr. Borntraeger, 1924. 
Lasarerr, P., “Sur une méthode permettant de démontrer 
la dépendance des courants océaniques des vents alizés 
et sur le réle des courants océaniques dans le changement 
du climat aux époques géologiques.”’ Beitr. Geophys., 21: 
215-233 (1929). 
Lewis, G. N., ‘“‘Thermodynamiecs of an Ice Age: the Cause 
and Sequence of Glaciation.’’ Science, 104: 43-47 (1946). 
Mitanxovircn, M., “‘Mathematische Klimalehre und as- 
tronomische Theorie der Klimaschwankungen,”’ in Hand- 
buch der Klimatologie, W. K6pprn und R. Gricur, Bd. 1 
Teil A, SS. 1-76. Berlin, Gebr. Borntraeger, 1930. 
Moreau, R. E., ‘Pleistocene Climatic Changes and the 
Distribution of Life in Hast Africa.”’ J. EHcol., 21: 415- 
435 (1938). 
Movius, H. L., Jr., The Irish Stone Age, Its Chronology, 
Development, and Relationships. Cambridge, University 
Press, 1942. (See Fig. 8, p. 60, and Table IV, p. 63) 
Nisson, E., ‘‘Quaternary Glaciations and Pluvial Lakes 
in British East Africa.’’ Geogr. Ann., Stockh., 18: 249- 
349 (1931). 
Overy, C. D., ‘‘Note on the Evidence for Climatic Changes 
from Sub-oceanic Cores.’’ Weather, 4: 228-231 (1949). 
Pencs, A., und Brisckner, E., Die Alpen im Hiszeitalter, 3 
Bde. Leipzig, Tauchnitz, 1909. (See pp. 1168-9) 
Prerrersson, O., “Climatic Variations in Historic and Pre- 
historic Time. Svenska hydrogr.-biol. Komm. Skr., No. 5 
(1914). 
Rep, EH. M., and Caanpuzr, M. E. J., The London Clay 
Flora. London, British Museum, 1933. (See pp. 63-82) 
Simpson, G. C., ‘“‘Past Climates.”” Mem. Manchr. lit. phil. 
Soc., 74: 1-34 (1929). 
Waener, A., Klimadnderungen und Klimaschwankungen. 
(Die Wissensch., Bd. 92) Braunschweig, F. Vieweg & 
Sohn, 1940. 
WASHINGTON, CARNEGIE InstiTuTION, Publication No. 
352. Quaternary Climates. Papers by J. C. Jones, EH. 
Antevs, and E. Huntington, 212 pp. Washington, D.C., 
1925. 
Way ann, E. J., ‘“‘Rifts, Rivers, Rains and Harly Man in 
Uganda.” J. R. anthrop. Inst., 64: 333-352 (1934). 
Wiert, H. C., ““Long-Period Fluctuations of the General 
Circulation of the Atmosphere.”’ J. Meteor., 6: 34-50 
(1949). 
WINKLE, W. van, ‘‘Quality of the Surface Waters of Ore- 
gon.’ U. S. Geol. Surv. (Dept. of Interior), Water Sup. 
Pap. 363 (1914). 
ZeuneER, F.E., The Pleistocene Period; Its Climate, Chronol- 
ogy and Faunal Succession. London, Ray Society, 1945. 
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