254 
CRULSE OF H.M.S. CHALLENGER. 
remainder of the tube is covered with a quantity of 
yellow gelatinous matter, which greatly diminishes 
their beauty ; however, this coating is easily removed 
by washing and bleaching processes. These dredgings 
were repeated afterwards with great success, multi- 
tudes of these Regaderas,” as the Spaniards call 
them, being obtained, besides several other sponges of 
the same group, some of very graceful forms, and 
quite new to science. 
After coaling it was decided to leave, which we did 
on the 24th January, passing down the channel be- 
tween Zebu and Bohol. Before leaving our anchor- 
age, a very interesting account had been given of an 
active volcano in the small island of Camiguin, near 
the coast of Mindanao. As it was but little out of 
our way, it was decided to visit it, chiefly with a 
view to ascertain whether the immediate neighbour- 
hood of volcanic action had any influence on the 
temperature or other conditions of the sea-water. 
About noon on the 25th we were midway between 
the southern point of Bohol and the high, imposing 
island of Siquijor; the splendid mountain-range of 
Cuernos, in the island of Negros, closing in the view 
to the westward, with its dense forest and bright 
green vegetation reaching down to the sea. To the 
east we could see, at a distance of 50 or 60 miles, 
the island of Camiguin, its volcano giving out both 
smoke and steam. From this distance the top of the 
volcano seemed just on a level with the water, the 
