. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. I k H\ / THE BOTANICAL REVIEW -. The structure of protoplasm. Science 73: 1. 1931. -. The origin, composition and structure of cellulose in the 36 44. 45. living plant. Protoplasma 21: 129. 1934. 46. Spek, J. Zum Problem der Plasmastrukturen. Zeitsch. Zellen und Gewebelehre. 1: 278. 1924. 47. Gesetzmassige Substanzverteilung bei der Fuerhung des Ctenophoreneies. Arch. Entwicklungsmech. Organismen 107: 54. 1926. Plasmakolloide bei Befruchtung und Entwicklung des 48. Nerieseies. Protoplasma 9; 370. 1930. 49. Spierer, C. Un n
. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. I k H\ / THE BOTANICAL REVIEW -. The structure of protoplasm. Science 73: 1. 1931. -. The origin, composition and structure of cellulose in the 36 44. 45. living plant. Protoplasma 21: 129. 1934. 46. Spek, J. Zum Problem der Plasmastrukturen. Zeitsch. Zellen und Gewebelehre. 1: 278. 1924. 47. Gesetzmassige Substanzverteilung bei der Fuerhung des Ctenophoreneies. Arch. Entwicklungsmech. Organismen 107: 54. 1926. Plasmakolloide bei Befruchtung und Entwicklung des 48. Nerieseies. Protoplasma 9; 370. 1930. 49. Spierer, C. Un nouvel ultra-microscope. Arch. Sci. phys. et natur. 8: 121. 1926. 50. Sponsler, O. L. The molecular structure of the cell wall of fibers. A summary of X-ray investigations. Amer. Journ. Bot. 15: 525. 1928. 51. Sponsler, O. L., and Dore, W. H. The structure of ramie cellulose as derived from X-ray data. Colloid Symposium Mono. 4: 174. 1926. 52. Stamm, a. J. The state of dispersion of celulose. Journ. Amer. Chem. Soc. 52: 3047. 1930. 53. Thiessen, R. Physical structure of coal, cellulose fiber and wood as shown by the Spierer lens. Ind. Eng. Chem. 24: 1032. 1932. 54. Wilson, J. A. Swelling of protein jellies. Colloid Symposium Mono. 1: 210. 1923. 55. Wilson, E. B. The Cell. New York, 1925. 56. Zocher, H. Freiwillige Struckturbildung in Solen. Zeitsch. Anorg. Chem. 147: 91. 1925. M Eepriuted from Science, October 4, 1935, Vol. 82, No. 2127, page 336. AUTOMATIC FLOW-METER FOR DRIP SOLUTIONS IN PLANT NUTRI- TIONAL STUDIES Various means have been utilized for providing a constant nutrient flow to plants growing in pot cul- tures. It has been realized that definite conclusions from such studies need to be based on several pots in each series. The drip-nutrient method, when used for several large series, necessitates a system which is simple in construction and requiring a minimum of time for refilling the nutrient reservoirs. Bearing these facts in mind, an apparatus embodying an ap- p
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