35 
shown in the same field as above (No. 10). Two daughter-cells 
are seen lying side by side. The line of division is still per- 
ceptible. 
Gary N. Calkins (Biological Department, Columbia College). 
169. DEMONSTRATION OF BUTSCHLI’S ARTIFICIAL PROTOPLASM. 
For some years Professor Butschli, of Heidelberg, has been 
studying the structure of living protoplasm. This he describes 
as a “‘Schaumplasma,” or froth protoplasm, and compares it to 
certain structures in soap-suds, oil emulsions, etc. Upon experi- 
ment he found that he could make an emulsion which, under 
high magnification, closely resembles in structure and in motion 
living protoplasm. This mixture consists of olive oil and 
potassium carbonate. Under proper conditions of temperature 
the emulsion shows streaming motion almost identical with the 
motion of Amoeba protoplasm. 
170. A CILIATE INFUSORIAN (STYLONYCHIA) DURING NUCLEAR 
DIVISION. The preparation shows the interchange of micro- 
nuclei. This phenomenon was first observed by Stein for Sty- 
_ lonychia in 1861. Stylonychia has two micronuclei in different 
parts of the cell body, and when these divide the halves 
exchange places and thus the daughter-cells possess portions 
of each of the original micronuclei. Two of these halves are 
seen passing each other. 
171. A FLAGELLATE INFUSORIAN WITH A DISTRIBUTED NU- 
CLEUS. This organism was formerly considered a _ non- 
nucleated form and was supposed to belong to the group 
called Monera by Haeckel. A similar distributed nucleus is 
found in many bacteria. 
172. SUPPOSED YOLK FORMATION IN THE DEVELOPING EGG OF 
THE EARTHWORM (Lumoricus terrestris). This shows that the 
chromatic elements of the nucleus are the source of yolk sub- 
stance inthe egg. The large black mass (the yolk nucleus) out- 
side the nuclear membrane is derived from the chromatin. 
Minute fibres may be seen passing outwards from the yolk nu- 
cleus into the cell. These fibres break up into granules and 
become distributed throughout the cell, where they enlarge and 
form yolk substance. 
