The Evolution of Climates. — Manson. 157 
Recent Observations on European Dinosaurs. Amer. Jour. ScL 
(4), vol. 4, pp 413-416. 
1898. 
New Species of Ceratopsia. Ibid., vol. 6, p. 92. 
The Jurassic Formation on the Atlantic Coast. — Supplement. Ibid., 
pp. 105-115. 
Cycad Horizons in the Rocky Mountain Region. Ibid., p. 197. 
The value of Type Speciinens and Importance of their Preserva- 
tion. Ibid., pp. 401-405. 
The Origin of Mammals. Ibid., pp. 406-409. 
The Comparative Value of Different Kinds of Fossils in Determin- 
ing Geological Age. Abstract: Ibid., pp. 483-486. 
On the Families of Sauropodous Dinosauria. Abstract: Ibid., pp, 
487-488. 
1899. 
Footprints of Jurassic Dinosaurs. Ibid., vol. 7, pp. 227-232, pi. v. 
Note on a Bridger Eocene Carnivore. Ibid., p. 397. 
THE EVOLUTION OF CLIMATES. 
Ky Marsden Manson, San Francisco, Cal. 
(Continued from page 120.) 
Chapter V. 
The Premises ami the Solution. 
Whenever any line of iiivestigaiion leads to conflicting or doubtful 
■conclusions — whenever Nature' s recorded facts witl not fit the theories 
which have been advanced to account for them, it is best to turn back to 
first principles. 
In the brief review made in Chapter II., of the principal 
theories urged by various scientists as causes producing the 
Ice age, it was remarked of the first that it was universally 
admitted as true, and even taught in elementary works on 
physical geography, but that it failed to account for all the 
facts developed by the Ice age. This first theory was a de- 
crease in the original heat of the globe, the truth of which is 
established by a mass of indisputable geological evidence. 
In Chapter W ., an epitome was made of past climatic 
■conditions. These were traced back into the earliest geo- 
logical periods. At which period it is universally conceded 
that earth heat was the controlling factor in surface tempera- 
