Indeed, these opposite inclinations alone have a real existence, and X and Y are two symbols by which I represent at their arrival-or termination-points, so to speak, two different tendencies of my personality at successive moments of duration.
— from Time and Free Will: An Essay on the Immediate Data of Consciousness by Henri Bergson

"I wish I had one of that dandy black fox I trapped last winter, and the pelt of which brought me over a cool three hundred," remarked Ethan; and X-Ray was heard to take a quick breath as though given a little shock; at the same time winking aside toward Phil, who frowned, and shook his head threateningly.
— from Phil Bradley's Mountain Boys The Birch Bark Lodge by Silas K. Boone

8 January 1869, Reprint , etc., Article XV.
— from Lord Kelvin: An account of his scientific life and work by Andrew Gray

7 Radot, R. V., 333 Rapists, 193 Recessive, 433 , 442 Reconstruction period, 325 Redfield, C. L., 40 , 421 , 422 , 423 Refraction, 59 Regression, 112 , 442 Reid, G. A., 50 , 125 , 129 Religion and eugenics, 393 [Pg 456] Remote ancestors, 338 Research fellowship, 153 Reserve, 251 Restriction, methods of, 184 Restrictive eugenics, 175 , 184 Retrogression, 42 Revolutionary war, 426 Reward and punishment, 395 Rhode Island, 261 Rice, J. M., 95 Richmond, Va., 288 Riis, J., 1 Roman catholic church, 273 Roman republic, 284 Rome custodial asylum, 186 Roosevelt, T., 308 Ross, E. A., x , 301 Roumanians, 299 , 311 , 427 Round-headed type, 427 Rousseau, J. J., 75 Royal families, 17 , 20 , 118 , 410 Rubin, von Gruber and, 204 Ruskin, 342 Russell Sage Foundation, 186 Russia, 137 , 302 , 325 Russian Jews, 427 Russians, 259 , 302 , 311 , 427 Russo-Hebrew, 302 Russo-Japanese war, 321 Ruthenians, 311 S Sacerdotal celibacy, 222 St. Louis, 154 St. Paul, public schools of, 372 Salpingectomy, 185 San Domingo, 289
— from Applied Eugenics by Roswell H. (Roswell Hill) Johnson

If we wish to embody the proposition in a mathematical statement, we may do so in the following simple manner: Let a represent the total quantity of blood, b , the amount of remedy exhibited, and x the magnitude of the physiological effect.
— from Scientific American Supplement No. 822, October 3, 1891 by Various

Can ratify executive acts, XII.
— from Charles Sumner: his complete works, volume 20 (of 20) by Charles Sumner