NOTES 
119 
and have tried to impress upon my mind in practical 
ways the principles of action of these three classes of 
micro-organisms.” 
Definitions are said not to define, but who can im¬ 
prove upon this one from Kentucky? An infectious 
disease is “a disease which is contracted from disease 
germs which make a specialty of this work,” and this 
is as true to facts, although more difficult to read 
aloud, “Bacteria are infinitely small, intensely ener¬ 
getic, enormously prolific protoplasmic micro-organ¬ 
isms.” 
A little knowledge is not always a dangerous thing. 
One woman says, “I thought when I took up the first 
lesson paper that there was nothing in it I should ever 
understand, but now it looks so different.” She had 
seen molds through a magnifying glass, and goes on 
to say, “At any other time I wouldn’t have given it a 
look or thought.” 
A guide-post which points decidedly in the direction 
of success reads*. 
“Thank you more than I can say for the severity of 
your criticisms on the answers I sent. I liked it and 
because of it feel more confidence in the whole course.” 
From Ohio comes this report: “I did find a doctor 
in our town who .... helped me to see things. 
“I had an idea that the contents of the Petri dish 
might be viewed at once. . . . The doctor said 
“Yes, under the focus it would be as large as the state 
of Ohio.” 
