Carnegie Institution of Washington Publication (No. 130)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...on this date showed eight preparations showing marked growth and development in leaves, tendrils, and internodes. All were placed in a lath shelter. July 30, 1909.--All of the above preparations were showing vigorous development under the influence of the summer rains. In accordance with a plan for a systematic examination of the relative salt content and acidity of the plants used as test parasites and as enforced hosts, freshly-cut stems of Cissus, such as were used for slips in making insertions, were analyzed in the chemical laboratory of the Arizona Agricultural Experiment Station on June 5, 1909. The plants from which these stems were taken had been watered and were as active as in the beginning of the foresummer in the open. The acidity was found to be equivalent to 0.215 gram of H, SO, _ per 100 c.c.; the total solids dissolved 5.268grams per 100 c.c., and the inorganic residue 1.39, representing salts carried in solution. A second analysis of young stems made in May, 1910, showed total solids of 7.88 grams per 100 c.c. of juice, of which 2.24 grams was inorganic. The osmotic activity of the sap of this material gave an average of 11.34 atmospheres as a result of several determinations. The comparison of these data with similar facts from the host is of great interest. Freshly-cut joints of Opuntia discata were taken August 13, 1909, representing a maximum of turgidity due to the summer rains. The acidity of the sap was found to be equivalent to 0.1207 gram H, SO, per 100 c.c. of sap, the total solids being 3.836 grams, of which 0.928 gram was inorganic or ash. Freshly-cut joints of Opuntia Makeana were taken on August 13, 1909, and the acidity of the expressed sap was found to be equivalent to 0.1429 gram of H, SO, per 100 c.c. of sap, this amoun...