Sept. 23, 1886] 
Tue Canadian salmon on view in the Canadian Section of the 
Colonial and Indian Exhibition which were hatched out last 
April in the building are thriving well. 
THE Indian fish lately imported into the Aquarium of the 
Colonial and Indian Exhibition from Calcutta seem thoroughly 
at home in their artificial existence. There are two species on 
view, viz., the Sacchobranchus fossilts, or scorpion fish, and the 
Ophiocephalus striatus, or walking fish. A large consignment 
of German carp has just arrived, together with some Chinese 
goldfish and specimens of S7/uris glanis. 
THE first field-meeting of the County of Middlesex Natural 
History and Science Society was held on Saturday, the r8th 
inst., at Hampsiead and Highgate. Between 60 and 70 mem- 
bers assembled at Hampstead Heath Station at 2.30 p.m., and 
were conducted thence by the Rev. F. A. Walker, D.D., and 
Mr. Clement Reid, F.G.S. Passing along the top of the Vale 
of Health to ‘‘ Jack Straw’s Castle,” the party proceeded along 
the northern side of the Heath and reached ‘‘ The Spaniards ” 
about 4.30. At different points on the route the geology and 
physical features of the district were explained by Mr. Reid. 
At ‘‘ The Spaniards” the party were unexpectedly met by Mr. 
Goodwin, of Highgate, who had obtained the kind permission 
of Lord Mansfeld for the members to walk through the Park. 
Mr. Goodwin conducted the microscopical section to the ponds. 
where they were richly rewarded. Leaving the Park, the party 
proceeded to Highgate Schools, where they were received 
by Dr. McDonall, the head master, entertained at tea by the 
honorary secretary, Mr. Klein, and they afterwards inspected 
the collections of insects, mostly collected and arranged by Dr. 
Walker. At 7 o’clock the members assembled in the theatre 
of the Highgate Institute, where, after some short notes by Mr. 
Lloyd, the honorary secretary of the Institute, on ‘* High- 
gate and Highgate Worthies,” Mr. Mattieu Williams read a 
short paper upon ‘‘ Some Peculiarities of London Atmosphere,” 
which was followed by a discussion, in which Messrs. W. 
L. Carpenter, RK. Hammond, and others took part. The Rev. 
Dr, Walker then made some interesting remarks on the different 
orders of insects represented in the collections of the Highgate 
Schools. 
Science reports that Captain Dutton, of the United State; 
Geological Survey, has recently been engaged in studying Crater 
Lake in Oregon, which he has found to be probably the deepest 
body of fresh water in the country. Boats were transported 
over a hundred miles of mountain road from Ashland, and had 
to be lowered goo feet to the water. The steepness of the wall 
_ of the lake was very great. The depths ranged from 853 to 
1996 feet, the average being about 1490 feet. The descent to 
the lake is partly over talus, covered with snow above, and rocky 
broken ledges lower down. 
THE works for deepening the Seine to a depth of 3 metres 
have been finished. The river can now be navigated by vessels 
of about Iooo tons burthen, which are supplied with movable 
masts and chimneys for the bridges. : 
WE have received the report of the Otago Acclimatisation 
Society for the past year. The operations of the Society have 
been almost entirely confined to pisciculture, and apparently 
must be so for some years owing to the spread of poisoned grain 
over the country, and to the increase of the natural enemies of 
the rabbit, which are also the natural enemies of birds. But in 
pisciculture much has been done, and much more remains to be 
done, for the salmon and the herring are not yet numbered 
amongst New Zealand fishes. An experiment, which has so far 
been successful, for the introduction of the Sa/mo salar has been 
made ; similarly in the cases of Loch Leven trout, Sa/mo fon- 
NATURE 
501 
tinalis, and brown trout. Brown trout have been acclimatised 
with such success, that the Society is in a position to supply an 
almost unlimited demand for ova, as well as to provide liberally 
for the requirements of New Zealand streams. ‘The late secre- 
tary, Mr. Arthur, had begun the collection of a series of data 
from which he hoped to gain some information respecting the 
sea-fish of New Zealand, and ultimately to arrive at something 
definite in regard to the nature and habits of some of the most 
important of them. The collection and tabulation of these 
returns and the important investigations of Mr. Arthur are being 
continued by Mr. Thomson. It is perhaps scarcely necessary to 
add that Sir James Maitland has seconded the efforts of the 
Society in acclimatising Sa/monide in every pos-ible way. The 
only wonder is that important public work of this nature should 
be left wholly to private endeavour. 
A ‘‘transportable electric lighthouse” has been lately in- 
vented by M. Beduwe, a builder in Li¢ge. The idea is, to 
furnish the light in any place on short notice ; and it is thought 
the apparatus might prove useful in public works, cases of 
accident, gatherings in public places, /é¢es, &c. The con- 
stituent parts are (1) a telescopic system of copper tubes bearing 
the light; (2) a three-cylinder steam-engine to drive either a 
Gramme machine, or a suction and force pump ; (3) a vertical 
boiler on the tubular system; and (4) a reservoir for water. 
The whole is mounted on a four-wheeled carriage. The light is 
raised by hydraulic force. Further details may be found in Ze 
Génie Civil of September 4. 
THE first number of a monthly scientific journal made its 
appearance at Rio de Janeiro on July 25 in connection with the 
Philotechnic Institute of that city. It bears the title of Revista 
Philotechnica, and takes the place of the recently defunct Revista 
Polytechnica, Its object will be the practical and experimental 
study of the sciences, and of their application especially to the 
development of the arts and industries in Brazil. The first 
number contains papers on practical astronomy, by F. Behring ; 
on building materials, by F. de Sa; and on practical chemistry, 
by Ad. Uchda, chief editor. 
A New York telegram states that several detonations and 
tremors occurred at Summerville between Saturday night and 
Monday night, and three shocks of earthquake, two of which 
were accompanied by detonations, were also felt there early on 
Tuesday morning. At Charleston three shocks of earthquake 
occurred on Monday night, one of which, at about daybreak, 
shook the houses to such an extent that many of the occupants 
ran terrified into the streets. One of the shocks was accom- 
panied by detonations. 
THE additions to the Zoological Society’s Gardens during the 
past week include a Malbrouck Monkey (Cercopithecus cyno- 
surus 2) from West Africa, presented by the Rev. H. R. 
Moolenaar ; a Black-backed Jackal (Canzs mesomelas) f:om West 
Africa, an Algerian Tortoise (Zestads mauritanica) from North 
Africa, presented by Mr. A. T. Marsh ; two Elegant Galidias 
(Galidia elegans) from Madagascar, presented by Mr. Burt. C. 
Muller; two Black Rats (AZus rattes) from Sark, Channel 
Islands, presented by Mr. W. F. Collings; a Bateleur Eagle 
(Helotarsus ecaudatus) from Lamoo, East Africa, presented by 
Dr. W. Somerville; a Wild Duck (Axas boschas), European, 
presented by Mr. K. Lawson; a Barn Owl (Stix flammea), 
European, presented by Mrs. E. Holloway ; a Common Mar- 
moset (Hapale jacchus), two Black-eared Marmosets (afale 
penicillata) from South-East Brazil, a Common Otter (Lutra 
vulgaris), British, two Ariel Toucans (Ramfhastos ariel) from 
Brazil, deposited ; a Common Crowned Pigeon (Gozva coronata), 
two Auriculated Doves (Zenaida auriculata), bred in the 
Gardens. 
