102 
THE OCEAN WORLD. 
SUB* 
The Bevolving Yolvox, V. globator (Figs. 32 and 33) is found in great 
abundance, during summer, in tanks and ponds of stagnant water. ™ 
consists of green or brownish-yellow globules about the eighth part of 
inch, formed of animalcules scattered round a gelatinous and diaphanous 
spherical membrane, each furnished with a Hagelliform filament an® 
with a reddish interior point, which Ehrenberg took for an ej e - 
Leuwenhoek first observed this Yolvox in marshy waters. Tb lS 
eminent naturalist has left a very interesting account of his observe 
tions on these microscopic inhabitants of the waters, displaying an 
amount of patience and address which 
cannot be too much admired ; his obser- 
vations were made w T ith a simple lenS> 
which he constructed himself. In on® 
hand he held his instrument, which 
very coarse if we compare it to the nror® 
perfect and infinitely more powerful i®' 
struments now in use; whilst, in th 0 
other hand, he carried to his eye th® 
glass tube full of water which contain^ 
the object under observation. “ The to 1 ' 
croscopes of Leuwenhoek,” says Dujardi®> 
“were the very smallest bi-convex len®i 
mounted in a silver frame. He made ® 
collection of twenty-six, which he be' 
queathed to the Eoyal Society of London- 
These instruments, subject to all the in- 
conveniences of a maximum of spherical aberration and a total want of 
stability, were only fit for use in the hands of Leuwenhoek himself, vh° 
had acquired, in his labour of twenty years, habits of observation which 
compensated, in great part, for the want of perfection in his instruments- 
The Euglenise are infusoria usually coloured green or red. The® 
form is very variable. They arc oblong or fusiform in shape, swelling 
at the middle during action, and contracted or bowl-shaped in repose, oi 
after death. They are furnished with the usual whip-shaped filament 
which issues from an opening in front, and from one or many reddish 
points irregularly placed anteriorly. • 
Euglenia viridis (Fig. 34) is the most common species, and, perhaps 
the most widely diffused of all the Infusoria. It is this animalcfll 6 
Figs. 32 aud 33. Volvox Globator 
(MUller), magnified 700 times. 
