The third morning, John was by Fitch on Climatic zones. He reviewed the marine and land faunas of the Mesozoic and Tertiary. The Jurassic and Cretaceous of Mexico was closely related to Europe that the countries geologi- cally were united in a Congress then. Always climatic zones of the Juan he said could not be maintained by his reasons could not out. He said the faunas showed that there was a cooling of the climate with justable glacial local con- ditions towards the close of the Upper Cretaceous. He said it was plainer than in the faunas, The differences indicated a warm area. A warming again took place in the Upper Eocene and Oligocene. The changes of I.G. spread from N.A. via the Antilles to S.A. To Asia by way of Dehring St. The basis for the cooling of the Late Cret. and of Tert. is largely based on land animals. The main cause for the cooling of climate he concluded was due to the loss of Carbon dioxide and water vapors. This loss took place through the calamities of rocks and by the storing of carbon