SCIENTIFIC SUMMARY. 
353 
glass should be attached externally over its site with an interposed drop of 
glycerine, to ensure a flat surface, and the microscope, placed on a proper 
support, should be brought up to it armed with a power of about eighty 
diameters. The light, the quantity of which must be regulated by a 
diaphragm of blackened card or metal, should be reflected from a plane 
mirror, and carefully adjusted so as to pass through the water directly in the 
axis of the tube of the microscope. By this means the whole development 
of the planula into the hydroid zoophyte, with the successive development 
of the polypary, and the budding of the polyps, may be seen in a very 
beautiful manner. — Vide Journal of Anatomy , No. ii. 
Newspaper Zoology. — The ’ Pall Mall Gazette has published the fol- 
lowing interesting note : — u The Courier de Saigon reports some extraordinary 
items of natural history from the land of the Anamites. There is a certain 
fish, called Ca-ong in the language of the country, which has distinguished 
itself to that degree that the King has bestowed upon it the proud title of 
“ Nam hai dui bnong gnan,” which, as everybody knows, means u Great 
General of the South Sea.” It appears that this laudable fish is in the habit 
of quietly paddling round the ships near the coast until somebody tumbles 
overboard. He then seizes him instantly, and, instead of eating him, 
gently carries him in his mouth to the shore. At Wung-tau, near St. 
James’s Cape, they keep a skeleton of this extraordinary philanthropist. It 
is about thirty-five feet long, possesses front teeth like an elephant, very 
large eyes, a black skin very smooth, a tail like a lobster, and two wings on 
the back.” 
The Salmon in Australia. — There can be no longer any doubt of the 
success of the experiment in introducing the Salmon into Australia. The 
eggs were hatched, and the young were turned into the sea. From the sea 
they have returned, and are mounting the River Derwent. So states a recent 
letter from Dr. Officer, of Hobart Town. This is a great fact for fish- 
hatchers. Pisciculture is no longer a science simply, it is an useful art. 
