EUCALYPTUS TREES. 1038 
just as it discloses even the sources of many of the 
most terrific and ravaging diseases of which the 
human frame is the victim. The microscope, that 
marvelous tool for discovery, has become, also, the 
guardian of many an industry. The processes of 
morbid growth, or the development and diffusion of 
the minute organism, between which descriptive bota- 
ny knows how to discriminate, are thus traced out as 
the subtle and insidious causes which at times involve 
losses that count by hundreds of thousands in a single 
year, even in our yet small communities. But while 
the microscope discloses the form and development 
of the various minute organisms which cause, through 
the countless numbers of individuals, at times the 
temporary ruin of many branches of rural industry, it 
leaves us not helpless in ourinsight how to vanquish 
the invaders. In correctly estimating the limits of 
the specific forms, calling forth or concomitant with 
some of the saddest human maladies, phytography 
shares in the noble aim of alleviating human suffer- 
ings, or restoring health and prolonging vital exist- 
ence. 
But it comes most prominently within the scope of 
this Industrial Museum to delineate for the agricul- 
tural and forest section, in explanatory plates, the 
morbid processes under which crops and timber may 
succumb, and an industry be paralyzed or a country 
be verily brought to famine ; it devolves on us, also, 
simultaneously to explain the effect of remedial agents, 
such as sound reasoning from inductive science sug- 
gests or confirms. To array samples of all field 
products which our genial clime allows us to raise 
is doubtless the object of an instructive institution, 
