. Outlines of botany for the high school laboratory and classroom (based on Gray's Lessons in botany) Prepared at the request of the Botanical Dept. of Harvard University. Botany; Botany. IG A pollen grain of the Pine, provided with two air-tilled \'esi- cles to give Imoyaney in the air. 234. Agencies and adaptations for intercrossing. — Tlie tiyents serving to transport poileii from llower to flower lire wind, \\'att'r, anil small animals ( insects). 235. Pollination by wind. — Among the adaptations displayed hy wind-pollinated flowers are to be mentioned the chtiracter and quantity o
. Outlines of botany for the high school laboratory and classroom (based on Gray's Lessons in botany) Prepared at the request of the Botanical Dept. of Harvard University. Botany; Botany. IG A pollen grain of the Pine, provided with two air-tilled \'esi- cles to give Imoyaney in the air. 234. Agencies and adaptations for intercrossing. — Tlie tiyents serving to transport poileii from llower to flower lire wind, \\'att'r, anil small animals ( insects). 235. Pollination by wind. — Among the adaptations displayed hy wind-pollinated flowers are to be mentioned the chtiracter and quantity of the pollen produced. Tims the pollen grain of tlie Pine con- sists of three compartments, the two lateral ones empty and serving as wings (Fig. 165). "The im- mense abundance of pollen, its lightness, and its free and far diffu- sion through the air in Pines, Firs, and other Conifer;e, are familiar. Their pollen fills the air of a forest during anthesis ; and the ' showers of sulphur,' popularly so-called, the yellow po\vder which after a transient shower accumulates as a scum on the surface of water several or many miles from the nearest source, testifies to these ;^ All cat- kin-hearing trees — except Willows — an Graj', "Structural Botany," p. 217 ii^BiW* 1117. A ^-ersalih KB. Plumelikc stig- mas of a Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Leavitt, Robert Greenleaf, 1865-1942; Gray, Asa, 1810-1888. Field, forest, and garden botany. New York, American Book Co
Size: 813px × 3072px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1901
