Graphical data are presented for the refraction seismograph, torsion balance, and reflection seismograph in the Gulf Coast over the period July 1930 to February 1936. For comparison, the variations in the price of 30 degrees Baume crude oil at Houston are presented for the same period.The results indicate that: (1) The refraction seismograph was discarded before the 1931 minimum in the price of oil. (2) During this 1931 minimum, exploration of any kind was practically non-existent. (3) The 1933 minimum, on the contrary, seems to have effected contract operations more than company owned operations. (4) Company owned torsion balance operations seem to have reached a saturation point while contract torsion balance operations are rapidly decreasing from their 1934 peak. (5) Company owned reflection operations have shown a steady increase of ten crews per year while contract operations have shown a very irregular increase, averaging six crews per year, since 1932. (6) New contract reflection companies have appeared since 1930 at the rate of three per year. (7) The peak of contract reflection operations will probably be reached in 1937 or 1938, after which these operations will disappear in the same fashion as did the contract torsion balance operations.