456 JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES VOL. 13, No. 21 
tions were all made on whole hand specimens with the balance, in- 
closed air being expelled by exposure in water to a pressure of about 
2 em., and subsequent soaking for eight hours before weighing in 
water. 
The results, given in Table I, indicate that the average density of 
the rocks of Haleakala is 2.812, which is markedly lower than that of 
Mauna Kea (2.963). From this Haleakala density the mean density 
of the Earth, using Preston’s value 6 = 0,484 for Haleakala, would 
be 5.877, a figure that is about as much above the accepted value as 
that derived from the Mauna Kea data is below it. The average of 
the two values for A, based on my specimens from Mauna Kea and 
Haleakala, is 5.560, which is fairly close to the accepted value. 
TABLE I 
7 MAUNA KEA HALEAKALA 
Sp. gr. C° | Density Sp. gr. c° Density 
2.870 ile 2.864 2.706 si 2.698 
2.911 (Daly) 2.911 2.734 PAaye 220 
2.761 (Daly) 2.761 2.924 PASS 2.915 
2.982 223 2.976 2.836 25° 2.828 
3.040 22 3.033 2.929 2p 2.920 
3.018 APB Ia 3.010 2.788 pate 2.780 
2.994 Ped ah 2.987 2.718 25 2.710 
2.972 yy 2.968 3.067 252 3.058 
2.978 22.30 2.971 2.680 aD 2.672 
2.959 AA EP 2.954 
3.164 25° 3.158 
Average 2.969 2.963 2.820 2.812 
SCIENTIFIC NOTES AND NEWS 
The death is announced of Rev. Joun THompson Heprick, at St. Andrew- 
on-Hudson, Poughkeepsie, N. Y., October 24. Dr. Hedrick was formerly 
director of the Georgetown University Observatory. He was a generous 
contributor to astronomical publications and an accepted authority on the 
_ subjects upon which he wrote. 
A “get together meeting” of the Society of the Sigma Xi of Washington 
and vicinity was held at the Cosmos Club on November 22, 1923. Ten- 
minute talks on The most interesting thing I have seen the past summer 
were made by various members, including L. O. Howarp on the Wellcome 
Medical Historical Museum in London, Paunt BarrscH on under-water 
“movies” in the Bahamas, H. L. SHanrz on botanical excursions in Switzer- 
land, E. E. Stosson (president of the local Society) on electrification in 
Sweden, W. T. Ler on the newly explored enormous caves in New Mexico, 
EK. D. Batt on petrified forests in the Bad Lands. CHARLES Brooks, of 
the Department of Agriculture is secretary. 
