THERMAL CONDUCTIVITIES OF ROCKS 283 



as compared with those obtained in the petroliferous region of Krosno, 

 Boryslaw, and Bitkow, are of great interest. 



The mean geothermal degree in Kalusz is 31-5 m., a figure which is 

 almost identical with that established by Daly for some other parts in 

 Europe. 



In comparison with the temperatures in the wells Kornhaber II, in 

 Boryslaw, an increase of from 2-6° at a depth of 200 m. to 5-6° at 1,000 m. 

 has been observed. 



The authors established that, if compared with temperatures measured 

 at Paruszowice, in Silesia, those at Kalusz are higher at depths greater 

 than 770 m., while at smaller depths the difference is not significant. 

 Prof. Arctowski explains this difference by isostasy. 



Geothermal Gradients in Alfold. 

 By Josef V. Sumeghy. 



Jahrbuch der Koniglichen Ungarischen Geologischen Anstalt, vol. 28, no. 3, 



1929, pp. 276-370. 



In the brief preface of this work Sumeghy draws the attention of the 

 readers to the fact that unfortunately not all of the territory of Alfold (the 

 great Ungarian Plain) could be investigated. The geothermic gradients in 

 the Croatian and Slavonian parts of Alfold, as well as in the Banat and 

 Bacska, were not determined. This is especially regrettable owing to the 

 fact that these parts have the greatest number of deep wells, thus the data 

 obtained there would be of great value. 



The work is divided into the following chapters : 



1. Calculation of the depth stages. 



2. Enumeration of the deep wells examined. 



3. Reasons for the differences of the geothermal gradients in Alfold. 



(a) The different heat conductivities of the rocks. 



(b) The effect of tectonic causes. 



(c) The effect of heat produced by the decomposition of organic 

 substances. 



(d) The effect of the occurrence of gas. 



(e) The effect caused by the air. 



(/) The effect caused by radium emanations. 

 (g) Other less important effects. 

 (h) The influence of deep water. 



4. The geothermal depth zones of the Alfold. 



(a) The first geothermal depth zone. 



(b) The second geothermal depth zone. 



(c) The third geothermal depth zone. 



(d) The fourth geothermal depth zone. 



5. Relation of the geothermal gradients to the structure of the Alfold. 



(a) The normal geothermal gradient of the Alfold. 



(b) The higher and lower gradients. 



(c) The directions and breaking of lines which can be proved to be 

 based on the lower gradients. 



(d) Transition zones. 



A tectonic map of the Alfold and a large number of diagrams and tables 

 are given. A list of 151 titles of the literature used is added. 



