Adapted from Lewis Carroll’s Symbolic Logic (1896)

“Classification,” or the formation of Classes, is a Mental Process, in which we imagine that we have put together, in a group, certain Things. Such a group is called a “Class.” This Process may be performed in three different ways, as follows:

(1) We may imagine that we have put together all Things. The Class so formed (i.e. the Class "Things") contains the whole Universe.

(2) We may think of the Class "Things," and may imagine that we have picked out from it all the Things which possess a certain Adjunct not possessed by the whole Class. This Adjunct is said to be “peculiar” to the Class so formed. In this case, the Class "Things" is called a “Genus” with regard to the Class so formed: the Class, so formed, is called a 'Species' of the Class "Things": and its peculiar Adjunct is called its “Differentia.”

As this Process is entirely Mental, we can perform it whether there is, or is not, an existing Thing which pos- sesses that Adjunct. If there is, the Class us said to be “Real;” if not, it is said to be “Unreal,” or “Imaginary.”

[For example, we may imagine that we have picked out, from the Class "Things," all the Things which possess the Adjunct "material, artificial, consisting of houses and street"; and we may thus form the Real Class "towns." Here we may regard "Things" as a Genus, "Towns" as a Species of Things, and "material, artificial, consisting of houses and streets" as its Differentia. Again, we may imagine that we have picked out all the Things which possess the Adjunct "weighing a ton, easily lifted by a baby"; and we may thus form the Imaginary Class "Things that weigh a ton and are easily lifted by a baby."]

(3) We may think of a certain Class, not the Class "Things," and may imagine that we have picked out from it all the Members of it which possess a certain Adjunct not possessed by the whole Class. This Adjunct is said to be “peculiar” to the smaller Class so formed. In this case, the Class thought of is called a “Genus” with regard to the smaller Class picked out from it: the smaller Class is called a “Species” of the larger: and its peculiar Adjunct is called its “Differentia.”

[For example, we may think of the Class "towns," and imagine that we have picked out from it all the towns which possess the Attribute "lit with gas"; and we may thus form the Real Class "towns lit with gas." Here may regard "Towns" as a Genus, "Towns lit with gas" as a Species of Towns, and "lit with gas" as its Differentia. If, in the above example, we were to alter "lit with gas" into "paved with gold," we should get the Imaginary Class "towns paved with gold."]

A Class, containing only one Member is called an “Individual.”

[For example, the Class "towns having four million inhabitants," which Class contains only one Member, viz. "London."]

Hence, any single Thing, which we can name so as to distinguish it from all other Things, may be regarded as a one-Member Class.

[Thus "London" may be regarded as the one-Member Class, picked out from the Class "towns," which has, as its Differentia, "having four million inhabitants."]

A Class, containing two or more Members, is sometimes regarded as one single Thing. When so regarded, it may possess an Adjunct which is not possessed by any Member of it taken separately.

[Thus, the Class "The soldiers of the Tenth Regiment," when regarded as one single Thing, may possess the Attribute "formed in square," which is not possessed by any Member of it taken separately.]

Adapted from The Hypocrisy of American Slavery (1852) by Frederick Douglass

Fellow citizens, pardon me, and allow me to ask, why am I called upon to speak here today? What have I or those I represent to do with your national independence? Are the great principles of political freedom and of natural justice, embodied in that Declaration of Independence, extended to us? And am I, therefore, called upon to bring our humble offering to the national altar, and to confess the benefits, and express devout gratitude for the blessings resulting from your independence to us?

Would to God, both for your sakes and ours, that an affirmative answer could be truthfully returned to these questions. Then would my task be light and my burden easy and delightful. For who is there so cold that a nation's sympathy could not warm him? Who so obdurate and dead to the claims of gratitude that would not thankfully acknowledge such priceless benefits? Who so stolid and selfish that would not give his voice to swell the hallelujahs of a nation's jubilee, when the chains of servitude had been torn from his limbs? I am not that man. In a case like that, the dumb might eloquently speak, and the "lame man leap as an hart."

But such is not the state of the case. I say it with a sad sense of disparity between us. I am not included within the pale of this glorious anniversary! Your high independence only reveals the immeasurable distance between us. The blessings in which you this day rejoice are not enjoyed in common. The rich inheritance of justice, liberty, prosperity, and independence bequeathed by your fathers is shared by you, not by me. The sunlight that brought life and healing to you has brought stripes and death to me. This Fourth of July is yours, not mine. You may rejoice, I must mourn. To drag a man in fetters into the grand illuminated temple of liberty, and call upon him to join you in joyous anthems, were inhuman mockery and sacrilegious irony. Do you mean, citizens, to mock me, by asking me to speak today? If so, there is a parallel to your conduct. And let me warn you, that it is dangerous to copy the example of a nation (Babylon) whose crimes, towering up to heaven, were thrown down by the breath of the Almighty, burying that nation in irrecoverable ruin.

Fellow citizens, above your national, tumultuous joy, I hear the mournful wail of millions, whose chains, heavy and grievous yesterday, are today rendered more intolerable by the jubilant shouts that reach them. If I do forget, if I do not remember those bleeding children of sorrow this day, "may my right hand forget her cunning, and may my tongue cleave to the roof of my mouth!" To forget them, to pass lightly over their wrongs and to chime in with the popular theme would be treason most scandalous and shocking, and would make me a reproach before God and the world.

My subject, then, fellow citizens, is "American Slavery." I shall see this day and its popular characteristics from the slave's point of view. Standing here, identified with the American bondman, making his wrongs mine, I do not hesitate to declare, with all my soul, that the character and conduct of this nation never looked blacker to me than on this Fourth of July.