The invention concerns an image database comprising a plurality of tables each including fields concerning at least image acquisition conditions, andor sample identification, the tables being connected to one another in accordance with selected relationships. To this end, the two window shade web can either be wound on separate windup shafts and spread out in the same direction from the same starting point, or the two window shade webs have been connected with each other and, after having been extended, are moved in the manner of a film in front of the window. The impeller comprises a front, a rear, a mount for fitting the impeller on the rotor with the rear of the impeller adjacent to the front end of the rotor, and a pair of impeller blades extending radially outwards from the mount. The new variety has heavy and regular fruit production in the mild-winter region of California’s Coachella Valley where harvest typically begins about 20 days before the \u2018Red Beaut\u2019 harvest begins in California’s San Joaquin Valley. The cylinder block of the invention has a water jacket which, when viewed in transverse section, is wider in an intermediate portion than at either its top or base.