746 
THE VOYAGE OF H.M.S. CHALLENGER. 
Yokohama Bay that the winds appeared to follow a definite course, viz. : — With a high 
barometer, light southerly winds and fine weather prevailed ; when the barometer fell 
the wind increased rapidly, and the weather became thick and dirty ; when the 
barometer reached its lowest point the wind suddenly shifted to the westward and 
northwestward, and the sky became clear ; the barometer now gradually rose and the 
wind which at first blew as hard from the N.W. as it had from the southward 
gradually decreased, shifted to the northward and northeastward, and fell light. 
At 4 p.m. Matoya fight bore N. 71° W., Kami Sima N. 15° W., Cape Sima, S. 77° W., 
and the ship was steered to the southwestward and southward and shortly after the land 
was lost sight of, the weather becoming thick and squally. The wind increased to a 
gale by midnight and the sea got up rapidly, so that the vessel with all four boilers 
was only steaming 3 knots against it. 
On the 14th, at 4 a.m., the sea had increased so considerably that the engines were 
eased, and the ship stood off the land on the starboard tack. At 6 a.m. the barometer 
reached its lowest point, 29 '62 inches, the weather cleared, and the wind shifted to the 
northwestward, the clouds disappearing as if a curtain had been withdrawn from the sky. 
After a short interval of calm the wind increased to a single-reefed-topsail breeze from 
the northwest, and there being a good deal of sea on the south of Oosima, the ship 
made but little headway against the combined influences of sea, wind, and current. At 
0.30 p.m. it was considered advisable to bear up for Oosima Harbour, where the vessel 
anchored at 3 p.m., with Itsino Sima Rock N. 50° E., Wooded Island S. 40° E., and west 
point of Mioga Sima S. 5° W. 
A number of the officers landed in the course of the afternoon at Nasingari village, 
and proceeded along the beach to the town of Kusimoto, and returned by a beautiful 
glen. The water in Oosima Harbour contained many Copepods, Ctenophores, Hydro- 
medusae, larvae of Annelids, Diatoms, and immense numbers of Noctiluca miliaris. 
These last were very large fine specimens, and in a great many instances they had 
swallowed several large Diatoms. One specimen was seen to eject the frustule of a 
Diatom through its cell- wall at a point nearly opposite to the point where the flagellum 
is inserted. The spot where the frustule was ejected closed immediately, but for a long 
time remained marked by star-like radiating lines ; similar star-like spots were noticed in 
several specimens, but not in the same position. The animal apparently ejects these 
frustules through any part of the surface of the body. The nucleus, which became 
coloured with carmine before treatment with spirit, was very minute and circular. 
On the 15th, at 5 a.m., the vessel left Oosima Harbour, going out through the south 
channel (having previously come in through the east). The day was calm and fine and 
the water smooth, and the ship proceeded along the land for Isumi Strait and Kobe. 
The Japan Stream was lost at 8 a.m., the surface temperature having decreased from 
67° to 65° '5. At 2 P.M. the ship passed through Isumi Strait, where the temperature 
