50 REPORT OF THE EXECUTIVE COMMITTEE. 



LiTTLEHALES, G. W. Altitude, azimuth, and geographical position. (J. B. Lippincott 

 Co., Philadelphia, Pa. 1906.) 



. The progress of science as exemplified in terrestrial magnetism. (Annual 



presidential address before Philosophical Society of Washington, Dec, 1905. Bulle- 

 tin Philosophical Society of Washington, v. xiv, pp. Z'^l-ZZl- I905-) 

 -, and Froley, J. W. A discussion of the results of observations for the variation 



of the compass made by navigators of the mercantile marine along the routes from 



the United States to Europe in the year 1894. (U. S. Hydrographic Office, Pilot 



Chart of the North Atlantic Ocean. Feb., 1905.) 

 Livingston, B. E. Desert Botanical Laboratory. Tucson, Ariz. A simple method for 



experiments with water cultures. (Plant World, v. 9, pp. 13-16. Jan., 1906.) 

 . Note on the relation between growth of roots and of tops in wheat. (Botanical 



Gazette, v. 41, pp. 139-143. Feb., 1906.) 



Paraffined wire pots for soil cultures. (Plant World, v. 9, pp. 62-66. Mar., 1906.) 



Lloyd, F. E., Desert Botanical Laboratory, Tucson, Ariz. Isolation and the origin of 



species. (Science, n. s., v. 22, pp. 710-712. Dec. i, 1905.) 



. Palo verde, the evergreen tree of the desert. (Torreya, v. 9, p. 165. July, 1906.) 



. The artificial induction of leaf formation in the Ocotillo. (Torreya, v. 5, pp. 



175-179- Oct., 1905.) . . , „, , . 

 . The Desert Botanical Laboratory of the Carnegie Institution of Washington. 



(Biologisches Centralblatt. In press.) 

 -, and Underwood, L. M. The species of Cyco podium in North America. (Bulle- 



tin Torrey Botanical Club, v. z?)^ pp. 101-124. 1906.) 

 LuTz, F. E., Cold Spring Harbor, N. Y. Preserving spiders' webs. (Science, n. s., v. 



XXIII, p. 391. Mar. 9, 1906.) 

 . The tegminal position in Gryllus. (Canadian Entomologist, v. xxxviii, pp. 



207-209. June, 1906.) 

 McClung, C. E., Lawrence, Kans. The chromosome complex of Orthopteran sperma- 

 tocytes. (Biological Bulletin. Oct., 1905-) 

 MacDougal, D. T., Desert Botanical Laboratory, Tucson, Ariz. The delta of the Colo- 

 rado River. (Bulletin American Geographical Society. Jan., 1906.) 



. Heredity and the origin of species. (Monist. Jan., 1906.) 



. Discontinuous variation. (Science, n. s., v. xxiv, p. 730. Dec. 7, 1906.) 



■ . Discontinuous variation in pedigree cultures. (Popular Science Monthly, v. 69, 



pp. 207-225. Sept., 1906.) 

 Mark, E. L., and Copeland, M., Cambridge, Mass. Some stages in the spermatogenesis 



of the honey bee. (Proceedings American Academy of Arts and Sciences, v. 42, 



pp. 101-112, I pi. June, 1906.) 

 Mast, S. O. See Castle, W. E. 

 Mayer, A. G., Tortugas, Florida. Medusae of the Hawaiian Islands collected by the 



steamer "Albatross" in 1902. (Bulletin U. S. Fish Commission. 1903-) 

 , and SouLE, Caroline G. Some reactions of caterpillars and moths. (Journal 



of Experimental Zoology, v. iii. No. 3.) 

 Mendel, L. B., Sheffield Scientific School, New Haven, Conn. Chemical studies on 



growth. (Proceedings British Medical Association, Toronto meeting, 1906, and 



British Medical Journal.) 

 . The alimentary enzymes of the embryo. (American Journal of Physiology, 



Proc. Physiol. Society, i8th annual meeting. Feb., 1906.) 

 Morse, H. N., Frazer, J. C. W., Hoffman, E. J., and Kennon, W. L., Johns Hopkins 



University, Baltimore, Md. A redetermination of the osmotic pressure and of the 



depression of the freezing-points of cane-sugar solutions. (American Chemical 



Journal. July, 1906.) 

 , Frazer, J. C. W., and Hopkins, B. S. The osmotic pressure and the depression 



of the freezing-points of solutions of glucose. (Amer. Chemical Jour. July, 1906.) 

 Nichols, E. L., and Merritt, E., Cornell University, Ithaca, N. Y. Further experiments 



on the decay of phosphorescence in Sidot blende. (Physical Review, v. xxiii, p. 27 • 



July, 1906.) 

 , . The decay of phosphorescence in Sidot blende. (Physical Review, v. 



xxii, p. 279. May, 1906.) 



The luminescence of Sidot blende. (Physical Review, v. xxi, p. 247. 



Oct., 1905.) 



Olive, E. W., University of Wisconsin, Madison, Wis. Cytological studies on the 

 Entomophthorese. I. The morpholog}^ and development of Empusa. (Botanical 

 Gazette, v. 41, pp. 192-208. Mar., 1906.) 



