Dana— Dodge's Observations on Halema'uma'u. 49 



debris-cone. No attempt to obtain the depth could be made on 

 account of the discharging vapors. The projection above the 



Fig. 1. Map of Halema'uma'a in July, 1888, by Mr. F. S. Dodge, reduced to 

 one-fourth. AB, CD, EF, G-H, courses of the sections in Figs. 2 to 5; m, 

 n, o, p, q, r, small cones ; s, highest summit ; t, next highest ; New L., New Lake. 



Figs. 2-5. Sections by Mr. Dodge of Halema'uma'u in July, 1888, along the 

 lines AB, CD, EF, G-H', vertical scale 400 feet to the inch, horizontal. 2000 feet ; 

 e, edge of basm of Halema'uma'u; I, active lava lake at west foot of debris-cone; 

 p, pit in debris-cone ; s, highest summit of cone. 



Fig. 6. Diagram sectioDS of the Halema'uma'u basin and its debris-cone, pre- 

 pared from the descriptions and maps; p, the pit of the cone; ee, edges of the 

 basin; A, condition in May, 1886; B, Oct. 1, 1886; C, Aug., 1887; D, July, 1888. 



floor of New Lake in fig. 2 is due to the " stranded floating 

 island." 



Am. Jour. Sci— Third Series, Vol. XXXVII, No. 217, 



4 



-Jan., 1889. 



