856 
troscopes in both cases. At the eastern 
extremity of the Sumatra stations Mr. 
Newall will be established at Doerian, 
above the Oembilien Coal Mines, near 
Sawah Loento, at the extreme end of the 
railway. The engineer of the mines, Mr. 
van Lessen, has put a house at the dis- 
posal of this party,-and a very good 
site has been found close at hand for 
the setting up of the instruments, which 
consist of (1) a powerful flint spectroscope, 
to be used in an attempt to determine 
whether the corona rotates ; (2) a quartz 
spectroscope, to be used for photographing 
the extreme ultra-violet spectrum and for 
a special search for Fraunhofer lines such 
as might be attributed to sunlight reflected 
by dust in the corona; (3) a celostat, to be 
used in connection (a) with polariscopic 
cameras in investigating the polarization of 
the light of the corona, (6) with a tele- 
photo camera in photographing the corona, 
(c) with a powerful grating spectroscope 
in getting monochromatic images of the 
corona. ‘This station is 1,200 ft. above sea 
level and it is at a considerable dis- 
tance to the east of the main range of 
the Barisan Mountains. It is to be hoped 
that, with the considerable uncertainty 
that exists in the weather and wind 
conditions, one at least of these extreme 
stations may be favored with a good view 
of the eclipse. At various points between 
these extreme stations many other parties 
are established. The Dutch party have 
a large camp at Karang Sago, close to 
Painau, on the coast, and have an exten- 
sive programme, including (a) photographs 
of the corona with cameras of very varied 
dimensions ranging from a 40-ft. telescope 
with aperture f191 to a short camera with 
aperture f13.5; (b) spectroscopic observa- 
tions of the corona and chromosphere; (¢) 
polariscopic observations to be carried out 
visually ; (d) measurements of the heat- 
radiation of the corona. (Professor Julius 
SCIENCE. 
[N.S. Vou. XIII. No. 335. 
has constructed a specially delicate thermo- 
pile with a view of getting absolute meas- 
ures of the total radiation of the whole 
corona and comparing it with that of the 
uneclipsed sun.) A party will probably also 
be sent with a prismatic camera to Fort de 
Kock, near the northern limit of the 
shadow. 
The observers from the United States 
Naval Observatory, together with affiliated 
parties from the Yerkes Observatory and 
the Smithsonian Institution, are established 
in an excellent site, the old fort at Solok. 
Here Professor Barnard is setting up his 
ccelostat and 61-ft. telescope with which he 
is going to photograph the corona, exposing 
plates 40 in. square for 24 minutes, being 
led to expect detail right up to the edge of 
these plates. For the shorter exposures he 
will be content to use smaller plates 30 in. 
square and 17 in. square. Professor Abbot 
and Mr. Draper, from the Smithsonian Insti- 
tution, come with this party and find a room 
in the fort that will serve admirably for their 
bolometric apparatus. Dr. Humphrys will 
probably take spectrographic apparatus to 
Fort de Kock not far from the northern 
edge of the moon’s shadow. Mr. Jewell 
brings out a battery of gratings of unusual 
size, both plane and concave, and will use 
films 36 in. long and 24 in. wide in getting 
extended spectra of the chromosphere and 
corona, special attention being given to the 
ultra-violet region of the spectrum. Pro- 
fessor Skinner, who is in charge of the 
whole party, has also brought large cameras, 
which will be used in a search for an intra- 
mercurial planet. 
Mr. Perrine, from the Lick Observatory, 
has established his camp on the race-course 
at Padang, and is setting up a 40-ft. tele- 
scope to point direct at thesun. He also 
has four 12-ft. cameras to be mounted on one 
axis and used in a search for Vulcan ; in 
this research 12 plates, 17 in. by 14 in., will 
be exposed, covering a wide range on either 
