4 _ Stadually assumes the oval form which it possesse 
BRIEFER ARTICLES. 
Intelligence manifested by the swarm-spores of Rhizophidium glo- 
bosum (A. Br.) Schroeter.—Some algz, mostly species of Spirogyra, 
collected during November, at Ithaca, N. Y., were kept in the labora- 
tory in open vessels by a cool window. During an examination of 
this material Dec. 18th, at 12:50 P. M., several nearly mature zoospor- 
angia were observed attached to a thread of Spirogyra. The zoo- 
sporangia were full size and the contents coarsely granular. These 
were mounted in water in a VanTieghem cell and kept for observa- 
tion of the escape of the zoospores. At 2 P. M. the protoplasm was 
segregating into 1sodiametric masses, the beginning of the zoospores. 
There was no opportunity for farther examination of the prepara- 
tion until 5:30 p. M. of the same day when fortunately the zoospores 
were escaping, about one-half having already made good their escape. 
Oae was at the moment squeezing itself through the rather small 
ostiolum at the apex of the zoosporangium, while the others were 
sailing about within it. Lying at the ostiolum, the body of the zoo- 
Spore against the wall of the zoosporangium, the swarm ‘cell begins 
amoeboid movements by throwing out the granular portion of the 
protoplasm at the end opposite from that which contains the hyaline 
sphere. Beside the extension of this part of the swarm cell the ex- 
truded portion also moves about over the inner surface of the wall in 
the effort to find the opening. When this is accomplished the flow- 
ing of the protoplasm continues, moving the body of the cell into the 
ostiolum. The anterior end of the ameboid cell having passed 
through the opening, enlarges, thus forming a constricted portion at 
the point of passage. At first the enlarged portions are of unequal 
Size, the outer part being the smaller. This increases in size as the 
protoplasm flows through until the two parts are equal, when the cell 
1s dumb bell shaped. Soon the outer portion is the larger and finally 
the entire mass of the protoplasm has flowed through, and the cell 
d before the attempt 
at passage. It remained poised at the ostiolum for a few moments as 
if getting itself in form again during the transition from the amoeboid 
orm to the swarm cell form, when suddenly it darted away. 
When there were but few swarm cells in the sporangium it was easy 
to note the maneuvers by which the cell determined the location of the 
-0stiolum. The swarm cell swung violently in irregular circles appar- 
€ntly usually keeping quite free from the walls of the zoosporangium. 
