...fountain vomiting forth from a circular cavity an impetuous torrent of FlG. 10.— SPONGE IN ACTION. opaque masses, which it strewed everywhere around....rolled on with a constant and equal velocity." The sponges perpetuate their race by a verv curious mode of increase. At stated periods there project from...

...diminish in the slightest degree the rapidity of its course. I continued to watch the same opening at short intervals for five hours, sometimes observing...stream rolled on with a constant and equal velocity." Subsequent observations have proved that the living sponge has the power of opening and closing at...

...it presented, a living fountain vomiting forth from a circular cavity an impetuous torrent of fluid, and hurling along in rapid succession opaque masses,...but still the stream rolled on with a constant and equable velocity. About the end of this time, however, I observed the current become perceptibly more...

...bringing one of the apertures on the side of the sponge fully into view, I beheld for the first time the spectacle of this living fountain, vomiting forth...stream rolled on with a constant and equal velocity." Subsequent observations have proved that the living sponge has the power of opening and closing at...

...coalita — and witnessed the same spectacle that we have attempted to describe. " He says : — ' On moving the watch-glass, so as to bring one of the...rolled on with a constant and equal velocity.' "The sight which Dr. Grant described so vividly we witnessed in a greater degree while observing our H....