Senior class buttons have arrived and will be placed on sale today at Leavitt and Peirce's and at the Harvard Co-operative at a price of 75 cents each, it was announced yesterday by the 1918 Class Day Committee. There has been great difficulty with the enameling work this year and as a consequence, the manufacture was delayed more than two months. For this reason the price is somewhat higher than in previous years. The sale will last only a few days and Seniors are requested to get their buttons at once before the supply is exhausted.