The peculiar flattening, or fasciation, of normally cylindrical shoots is frequently encountered in herbaceous plants. Notable in this respect is Celosia cristata, whose fastigiate character is inheritable. Woody plants seem to exhibit fasciation less frequently than herbaceous plants, and conifers less frequently than broad-leaved trees. Among conifers, spruce seems particularly subject to fasciation and pines less so. Early in the study of the phenomenon of fasciation it was believed that the thin, flat twigs were caused by the growing together of several twigs, but this idea is no longer held. Some internal physiological disturbance causes the growing point to become a growing line, resulting in the production of flattened twigs. The cause and nature of this physiological disturbance are not known. Pressure experimentally applied to the growing tip has not produced fasciation. TANNER (7) believes fasciation to be associated with over-nutrition. A considerable amount of literature is devoted to the description of fasciation, but the great majority of this work, particularly as it applies to conifers, is European. An easily procurable, general account of fasciation may be found in MASTER'S (4) well known work on vegetable teratology. SCHENCK (5) compiled much information dealing with fasciation in conifers and published several fine illustrations showing the flattening, bending, torsion, and abundant production of twigs characteristic of this phenomenon. TANNER has more recently described and figured fasciation in forest trees. In this country fasciation in conifers has apparently seldom been observed. HUBERT (3) figured a fasciated twig of larch, and BALDWIN (i) described a fasciated leader of Scotch pine which showed the characteristic flattening (22 mm. wide by IO mm. thick), the division into two, the bending due to differential growth, and the large number of