MICROSCOPY. 187 
Tue Warre BLOOD-CORPUSCLES A CONNECTING LINK. — The 
“ closing address” before the Oldham Microscopical Society, by 
its retiring President, Mr. James N ield, alludes to the white cor- 
puscles of human blood, their chemical composition, their ever 
changing form, their use in the economy of the body, and their 
nearly complete identity in form and chemical composition with 
the corresponding corpuscles in the blood of all the other verte- 
brate animals. He admits the conviction that these peculiar 
bodies are links connecting the humble rhizopods with the highest 
animals, in the former case floating in water and in the latter drift- 
ing in the plasma of the blood. He considers the naked ameba 
and the sarcode of the foraminiferous shell only free members of 
a family which are aggregated and communistic in the higher creat- 
ures from the sponge to man. | 
Marxines or Barriepoor Scares. — Mr. T. W. Wonfer as- 
sured the Brighton and Sussex Natural History Society that while 
examining these scales with reference to Dr. Anthony’s idea that 
the markings were tubercles on the ribs, he succeeded in obtaining 
: a view of some scales standing on edge, in which cases he could 
see the tubercles standing out distinctly from the ribs. The scales 
Should be examined from freshly killed insects, as they tend to 
become flattened in drying. 
Structure or Invusorra. — Prof. Edward Van Beneden ques- 
tions the pleuricellular nature of the Infusoria.. The belief that 
they were unicellular beings was generally abandoned as soon as 
their complex nature-became known; but he has found the Gre- 
garine, monocellular organisms, to attain a high degree of com- 
plication, and he conceives that the same may be true of the 
Infusoria. 
Tae Gontomerer Sracr. — The glass sliding-stage, moving 
upon a circular plate having concentric and graduated rotation, 
ecome, and is still more becoming, so important a contrivance 
in microscopy that its origin is a question of some importance. 
is stage seems to be known in Europe as Nachet’s invention, 
and it was doubtless from his new style of Students’ Microscope 
that it was adopted by the London makers. Mr. Joseph Zent- 
mayer of Philadelphia, who had made the plain glass stage long 
fore that time, constructed in the spring of 1859, for a Mr. 
Rosevelt of New York, a revolving glass stage which would be 
