quite sufficient for the orchardist's purpose, the benefit resulting from their labors being, therefore, mutual, though the orchardist doubtless derives in this case greater advantage from them than does their owner himself. Escaped swarms lodged in forest trees in the vicinity of the orchard are sometimes sufficiently numerous to perform the work well. The great value of bees as cross fertilizers makes their destruction a serious injury to the interests of the fruit grower. Therefore spraying with arsenicals during fruit bloom should never be practiced. The injurious insects can be reached quite as well before and after the blooming period. [Illustration: Fig. 52.--Heath-like wild aster (_Aster ericoides_). (Original.)] Bul. 1, new series, Div. of Entomology, U. S. Dept. of Agriculture. Plate III. [Illustration] Alfalfa (_Medicago sativa_). Bul. 1, new series, Div. of Entomology, U. S. Dept. of Agriculture. Plate IV. [Illustration] Esparcet or Sainfoin (_Onobrychis sativa_). 1, 2. 3, 4, parts of flower; 5, pod; 6, 7, seed Bul. 1, new series, Div. of Entomology, U. S. Dept. of Agriculture. Plate V. [Illustration] Sweet Clover or Melilot (_Melilotus alba_). Bul. 1, new series, Div. of Entomology, U. S. Dept. of Agriculture. Plate VI. [Illustration] Acacia (_Acacia constricta_), Bul. 1, new series, Div. of Entomology, U. S. Dept. of Agriculture. Plate VII. [Illustration] Mesquite (_Prosopis juliflora_). Bul. 1, new series, Div. of Entomology, U. S. Dept. of Agriculture. Plate VIII. [Illustration] Blue Weed or Viper's Bugloss (_Echium vulgare_). Bul. 1, new series, Div. of Entomology, U. S. Dept. of Agriculture. Plate IX. [Illustration] Crimson Clover (_Trifolium incarnatum_). Bul. 1, new series, Div. of Entomology, U. S. Dept. of Agriculture. Plate X. [Illustration] Alsike Clover (_Trifolium hybridum_). HONEY AND POLLEN PRODUCING PLANTS.