(103) ascent was begun at 11:45 and completed at the lip of the main crater at 12:30. This was about 500 yards across and about 300 feet deep. He could see the lava seething around at the bottom, exuding steam and yel- low, sulphurous smoke. I collected some geologic samples and left a car signifying another spot on the earth's crust where homo sapiens has set foot (and rejected as unfit for prologed habitation). On the western side there are two smaller craters, one 25 yards long by 15 feet wide, the other 150 yards x 25' feet. The latter is by far the most active, belching forth clouds of sulphur smoke. We could not get very close. To the east the side of the big crater is broken down and below it are many sheer drops. The entire extent of the lava bed, hot and cold measures over 5 sq. miles. The comparative inactivity of this active volcano should make it very interesting geologically. One can reach the very center of thermal activity. After taking all the rest of my exposure, we hurried back to our friends and the safari started back down with the main camp at 5:800 as the objective. Arrived just in time for a tre- mendous kai-kai, David had done quite well with his part of the collecting, augmenting the red-breast series considerably. Additional natives from Hamua have come up during my absence. We now number about 40 in toto. April-25- I could recognize a great deal of iron and sul- phur around the crater, water which flowed in numerous springs, cold as ice, had a decided taste. In the strata just below the crater around 500 feet CaCO3, Fe O2 and greenish sulphur deposit, could be seen, the principal base being vol- canic rock. I also noted crystalline formation - copper pyrites and agate quality. Hematite, calicite, silicon and galena were also