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And this accords perfectly with experiment. But it might here be asked: since the meeting of the wave AC against the surface AB ought to produce movement in the matter which is on the other side, why does no light pass there? To which the reply is easy if one remembers what has been said before.
Tack on cross pieces to prevent shifting, and then, starting from the bottom, make a mark every 10 inches on the outside corners, to show the position of the tops of the rungs. A piece of the wood to be used for making the rungs of is laid up to the pairs of marks in turn, and lines are drawn on both sides of it. Cutting the Notches. The side AC is 3/8 to 1/2 inch deep.
Gather in the same pile all the cards in the first letter of the alphabet, A, followed in successive parallel rows by all the B's, and so on, to the letter Z. Next, pursue the same course with all the titles, arranging under the second letter of the alphabet, Aa, Ab, Ac, etc., and so with all the cards under B. C. &c. for all the letters.
Now, in the same figure, if one draws EAF, which cuts the plane AB at right angles at the point A, since AD is perpendicular to the wave AC, it will be DA which will mark the ray of incident light, and AN which was perpendicular to BN, the refracted ray: since the rays are nothing else than the straight lines along which the portions of the waves advance.
De copia verborum ac rerum was also such a help for beginners, to provide them with a vocabulary and abundance of turns and expressions; and also the germs of a larger work: De ratione studii, a manual for arranging courses of study, lay in the same line. It was a life of uncertainty and unrest. The bishop gave but little support. Erasmus was not in good health and felt continually depressed.
Insigne gentis obliquare crinem nodoque substringere: sic Suevi a ceteris Germanis, sic Suevorum ingenui a servis separantur in aliis gentibus, seu cognatione aliqua Suevorum, seu quod saepe accidit, imitatione, rarum et intra juventae spatium; apud Suevos, usque ad canitiem, horrentem capillum retro sequuntur, ac saepe in ipso solo vertice religant.
The song had a lively air, and Jim picked the accompaniment on the banjo. Many of the negroes had good voices, and the singing was indeed excellent. While the dancers were singing the first verse, "I ac' monkey moshuns," the one in the middle would screw up his face and hump his shoulders in the most grotesque manner, to represent a monkey.
To-day theologians argue on different sides; and anxiety, serious, painful and life-long, reigns in the souls of many who struggle to recite the office, digne, attente ac devote. Authors generally give six causes which excuse a person from saying the Hours: lawful dispensation, important work, grave illness, grave fear, blindness, want of a Breviary. They are recorded in the well-known lines:
Cf. in Pisonem 73 pacis est insigne et oti toga, contra autem arma tumultus atque belli; De Or. 3, 167 'togam', pro 'pace', 'arma', ac 'tela', pro 'bello'. We have the same contrast between arma and toga in Cicero's own much-derided verse, cedant arma togae, concedat laurea laudi, which is defended by him, in Pis. 73 and Off. 1, 77.
A still later scribe making a copy of this vocabulary, or possibly combining two or three lists already in first-letter order, carried the alphabetical arrangement one stage further; instead of transcribing the A-words as they stood, he went through them, picking out first those that began with Aa-, then those in Ab-, then those in Ac-, and so on, to Az.
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