E. G. Wingate, who had become superintendent of Hawaii National Park, agreed with my dictum, made on the basis of seismograms and history, that the next outflow would come at the north within two years and would endanger Hilo. This I discussed at a public meeting of the Hilo Chamber of Commerce in January 1934, and the report was published under the title “The coming lava flow.” The prediction was fulfilled in December 1935, when the flow came as it had in 1843. The eruption broke out on top and traveled down to Humuula, the saddle between Mauna Loa and Mauna Kea, then pooled in the saddle and turned toward Hilo. [Illustration: _25. Jaggar in office of Observatory in “Tin House,” 1937_] [Illustration: _26. Bomb bursting on lava flow, December 27, 1935. Photo by Eleventh Photo Section, A.C., Wheeler Field, T.H._] The 1843 flow had reached the saddle and turned toward Kona, and the solid remnant of that lava bank deflected the 1935 puddle to the east. It was traveling toward Hilo at the rate of a mile a day. This was the signal to try stopping it by bombing from airplanes, a procedure which had been proposed from experience with flows in tunnels of their own crust, where a person on the Kilauea floor could look through a caved-in hole in the roof and see the glowing river inside. Thurston and I had discussed blasting such a roof to cool off the lava and pile it up, thus forcing it to a new outlet and stopping the frontal flow. It was Guido Giacometti of Olaa who suggested bombing rather than dynamiting. I called on the Army Air Force, and a conference was held in Hilo. With Colonel Delos C. Emmons, Wing Commander, I flew over the source tunnel. This was at 9,000 feet on the north side of Mauna Loa, where a gleaming silvery ribbon of pahoehoe emerged from a hole in the north slope. This was a crusted lava river, and the fliers were instructed to smash it with 600-pound demolition bombs of TNT. The forenoon of December 27 was fixed for the bombing; and by invitation of Herbert Shipman, Mrs. Jaggar and I went to Puu Oo Ranch on Mauna Kea to watch what happened. The day was clear, and I saw one explosion send up a column of incandescent liquid lava hundreds of feet high, looking like a geyser of blood. In the foreground was the front of the flow, which we watched as it moved toward Hilo. At the same time we were receiving reports from cowboys on its rapidly diminishing speed. For about a week the liquid lava remaining in the tunnels kept spilling forward, and then it stopped. The front was in the headwaters of the Wailuku River, Hilo’s water supply.