(By the way, the first two volumes are, respectively, here and here.)
1) “Mediocrity knows nothing higher than itself; but talent instantly recognizes genius.”
2) “It's a wicked thing to tell fibs.”
3) “Chloroform vapour does not help the palate.”
4) “Nothing clears up a case so much as stating it to another person.”
5) “Life is infinitely stranger than anything which the mind of man could invent.”
6) “When one tries to rise above Nature, one is liable to fall below it.”
7) “To a great mind, nothing is little.”
8) “All knowledge comes useful to the detective.”
9) “If a herd of buffaloes had passed along, there could not be a greater mess.”
10) “What object is served by this circle of misery and violence and fear? It must tend to some end, or else our universe is ruled by chance, which is unthinkable.”