THE Microscope. ~ 429 
clear again in clove oil and mount. Sections made in this way 
are necessarily somewhat thick for the reason that the different 
parts which are desired to show in the section seldom lie in the 
same plane, consequently they are best mounted in a cell 
ground into the slide which allows the cover-glass to be brought 
dewn close and making a handsome job when finished. The 
method may seem somewhat tedious and certainly requires 
some patience but the results more than repay for the trouble. 
Nore.—Dammar will be found the best medium for mount- 
ing. 
sr —_ 
SELECTIONS FROM THE PRESIDENTIAL ADDRESS OF 
DR. DALLINGER, GIVEN BEFORE THE ROYAL 
MICROSCOPICAL SOCIETY. 
C. H. Stowe tu. 
66 oe wide and diversified has the field of research become, that 
it is to experts chiefly that we must look for criticism, in- 
terpretation, and suggestion of the most lasting value.” 
_“ Exact and exhaustive research in the remotest fields must 
be encouraged and fostered.” 
“The larger proportion of the septic organisms whose life- 
history we have thoroughly studied, were distinctly nucleated 
bodies. I know of no clear reason for concluding that they are 
either vegetal or animal. They possess some of the character- 
istics of both, and certainly they represent the lowest organiza- 
tion of either great line of organic life.” 
In the act of self division “it can now be shown by the 
employment of the new lenses of greater aperture, that it is the 
nucleus that is first, and very profoundly, affected.” 
“In a thoroughly healthy, vigorous field of Zetramitus 
rostratus from ten to twelve fissions will be effected in one hour 
if we steadily follow one of the two divided organisms succes- 
sively in continuous divisions. This will continue for hours 
without cessation, causing a prodigious increase in the organ- 
ism.” | 
“ One thing appears clear: the nucleus is the centre of all 
the higher activities in these organisms. The germ itself ap- 
pears but an undeveloped nucleus.” 
3 
