260 
than when measured by the determination of electrical con- 
ductivity at a lower temperature. 
THE additions to the Zoological Society’s Gardens during the 
past week include a Macaque Monkey (M/acacus cynomolgus) 
from India, presented by Mr. J. H. Higgins; two Maholi 
Galagos (Galago maholi) from South Africa, presented by the 
Hon. Gilbert Johnstone ; two Common Badgers (A/e/es taxus), 
British, presented by Mr. A. Gorham; a Spring-bok (Gazedla 
euchore, 8), a Ring-hals Snake (Sefedon haemachates) from 
South Africa, four Spur-winged Geese (Plectropterus gambensts) 
from West Africa, presented by Mr. J. E. Matcham; two 
Lanner Falcons (Fadco /anarius) European, presented by Sir H. 
H. Johnston, K.C.B.; a Yellow-fronted Amazon (Chrysotes 
ochrocephala) from Guiana, presented by Mrs. G. F. Cote; a 
Hunting Crow (Céssa venatoria) from India, a Black-necked 
Grackle (Graculipica nigricollis) from China, a Larger Rocket- 
tailed Drongo (Déssemurus paradtseus) from India, a Sacred 
Kingfisher (7alcyon sancta) from Australia, a Black Hangnest 
(Casstdix ortzivora) from the Amazons, two Blackbirds ( 7urdus 
merula), European ; a Brown Thrush (7zrdus leucomelas) from 
South America, presented by Mr. Russell Humphreys ; an Arabian 
Baboon (Cynoceshalus hamad yas) from Arabia, three Barbary 
Partridges (Caccabis petrosa) from North Africa, three Western 
Pintailed Sand-Grouse (Plerocles pyrenaica), South European, 
a Grand Galago (Galago crassicaudata) from East Africa, three 
Black-headed Terrapins (Damonia reevest-unicolor), three 
Reeve’s Terrapins (Damonia reeves?) from China, a Home’s 
Cinixys (Cinzixys homeana), a Derbian Sternothere (Sverno- 
thaerus derbianus) from West Africa, three Reticulated Pythons 
(Python reticulatus) from the East indies, deposited; four 
Crested Pigeons (Ocyphaps lophotes) from Australia, an Ostrich 
(Struthto camelus, 8) from Senegal, a Sun Bittern (Zurypyoa 
helias) from South America, a Scarlet Ibis (Zudoctmus ruber) 
from Para, purchased ; a Japanese Deer (Cervus stka, 6), born 
in the Gardens. 
OUR ASTRONOMICAL COLUMN. 
CoMET 1899 a (SwirT).— 
Ephemeris for 12h. Berlin Mean, Time. 
1899. R.A. Decl. Br. 
h. m. s. . . 
july 13 TA 3) 13 +13 50°7 . 006 
15 I2 26 12 59°9 
17 2 el 12 12°1 
19 II 45 II 26°9 . 005 
21 II 36 10 4471 
23 Il 34 To! 356) 7.10704 
25 II 40 9 25°1 
27 LTS 3 8 48°3 
29 12 10 SI Sa ye OlO8 
I 12 32 a 73 0e7 
August 2 14 12 59 nee a AO. 
TEMPEL’s CoMET 1899 ¢ (1873 II.). 
Ephemerts for 12h. Paris Mean Time. 
1899. R.A Decl. Br. 
ek itl Sh Per 7 
July 13 20 31 7°6 —14 25 22 
14 2 20°5 14 55 18 
5 33, 3372 15 25 46 3°418 
16 34 4577 15 50 42 
17 35 580 16 28 5 
is). § sh 3 7mlO ae: 10) 59) 51 
LO Mees Bozzi 17 Sl Somers SE500 
20 20 39 34°3 -18 4 26 
The comet is still on the borders of Sagittarius and Capri- 
cornus, about 3° west of a and B Capricorni. M. L. Schulhoff 
points out in Ast. Mach. (No. 3574) that it is important to 
secure as many accurate observations of the comet as possible 
NO. 1550, VOL. 60] 
NATURE 
[JuLy 13, 1899 
at observatories of different latitudes during this apparition, as 
by this means our knowledge of the mass of Jupiter may be 
considerably improved. 
THE New ALLEGHENY OpseRVATORY.—A little over a year 
ago Mr, J. A. Brashear inaugurated a movement to provide for 
the erection of a new building and an adequate instrumental 
equipment for the Allegheny Observatory, and the fund, from 
numerous subscriptions received, has grown to such proportions 
that the plan shows every sign of success. Prof. F. L. O. 
Wadsworth, until recently a member of the staff of the Yerkes 
Observatory, has been appointed to the directorship, and the 
plans for the new building have been prepared by him. The 
largest instrument is to be a refracting telescope of 30 inches 
aperture, with object-glass by Brashear, and special provision is 
to be made for astrophysical investigations, which will form the 
principal work of the observatory. 
LEEDS ASTRONOMICAL Society.—The /ournal and Trans- 
actions for the year 1898, lately issued, maintains the excellent 
standard of former years. Among the many interesting papers 
mention may be made of ‘‘ The movements of the moon,” 
‘Star temples in Egypt,” ‘‘ Astronomy as applied to navi- 
gation.”” The volume contains two plates, one showing four 
drawings of Jupiter and one of Saturn made by Mr. H. J. 
Townshend, and the other a portrait of Mr. T. J. Moore, who 
has charge of one of the micrometers from the Oxford Observ- 
atory, with which he is engaged in measuring the plates for the 
Astrographic Catalogue. Accompanying this is a very lucid 
description of the work and scope of the Astrographic Survey, 
by Mr. Moore. 
THEORY OF THE MOTION OF THE MOON. 
THE second part of Dr. Brown’s ‘‘Lunar Theory ”’ contains the 
calculation of the terms of the third order in the eccentri- 
cities, inclination and ratio of the parallaxes. The first part 
(reviewed in NaTuRE, November 25, 1897) had already dealt 
with the general theory, the variation, and the terms of the first 
and second orders. It will be remembered that the differential 
equations to be solved are 
(D + 2)?20 + $®u + Sms — - ee —— > 00, 
(ues + 27) ° ds 
hb 
(D — m)?s+ 4s + 8ru — ess ——— 60, 
(zes + 27) * Ou 
(D? = m*)z — — 2 ,=7 40%, 
(ws +2")? dz 
The notation is sufficiently familiar to render explanation 
unnecessary. 
Dr. Brown’s procedure is as follows :—Let 
U=Uj tu, +My, S=2, +2 
where 7) denotes the variational terms 
Uy, 2 
the terms of the orders already calculated 
Uy, 2 
the terms of the next order to be calculated. 
Then expanding by Taylor’s theorem the unknown terms 
enter in the form 
¢-(D + m)Pu,+ Mow, + NOa, 
and 
D*%z, —-2Mz, 
M, N being functions of the known variational terms. 
The unknown terms enter under the same form every time, 
but if a solution with indeterminate coefficients be assumed, the 
coefficients in the simultaneous equations that result will depend 
upon the period of the inequality under consideration, and 
therefore, from the point of view of numerical solution, entirely 
different nearly every time. All who have had the practical 
mee Theory of the Motion of the Moon; containing a New Calculation of 
the Expressions for the Coordinates of the Moon in Terms of the Time.’’ 
By Ernest W. Brown, M.A., Sc.D., F.R.S. (from the A7emozrs of the Royal 
Astronomical Society, vol. liii.). 
