KELLICOTT, W. E., Growth of Brain tion Theory, ROBERT F. GRIGGS, Kleine on Nagana, H. B. WARD, 568 LINTON, EDWIN, Darwin's Origin of LOVELL, JOHN H., The Color Sense LUTZ, FRANK E., The Effect of the 248 MCCLENDON, J. F., Frog's Egg, the Totipotence of the First Two, 384 Mammoth, Traditions about, in Marchal on Environmental Effect, Mayer, A. G., Tortugas Laboratory Merriam, J. C., Nectosaurus, Roy Meves on Chondriosomes as Bearers Mice, The Inheritance of Coat Col- MILLER, NEWTON, The American MOODIE, ROY L., The Lysorophidæ, MORGAN, T. H., Breeding Experi- Movement in Plants, Darwin's Work Note of the Prairie-dog Ow1, which Organic Correlation, A Mechanism 572 Owl, Prairie-dog, Note which re- Parasitology, 62, 567 PARKER, G. H., A Mechanism for PAYNE, F., The Chondriosomes as PEARL, RAYMOND, Accuracy of the Peruvian Zoological Province, Mol- C. Plant, Phylogeny, 107; Cytology, Pleistocene Swamp Deposits in Vir- Potato, Heckel on Cultural Bed Poulton and Plate on Evolution, V. L. KELLOGG, 317 POWERS, J. H., Are Species Realities PRATT, HENRY S., The Cuticula and Presence and Absence Hypothesis, Raepke, W., on Hybridology and Rats, Breeding Experiments with, RICHARDS, HERBERT MAULE, Dar- Riddle, O., Melanin Color Forma- tion, T. H. MORGAN, 509 Laboratory of the Carnegie Insti- Robertson, T. B., The Normal Rate SCHARFF, R. F., An Early Tertiary Schenck, H., The Origin of the 107 Schwarz, Hugo, on Stegocephala, Seeds, Number per Pod in the SHAW, CHARLES H., Present Prob- cies and Varieties, 383; "Pres- 410 Sleeping Sickness Bureau, HENRY Slugs, Experiments in Breeding, T. SPALDING, VOLNEY M., Local Dis- STAFFORD, J., Larva and Spat of the Starfishes on the Northwest Amer- Tertiary Land Connection between Toad, The American, NEWTON MIL- Tortugas Laboratory of the Carnegie Institution, WILLIAM E. RITTER, 693 Traditions in Northeastern Siberia about the Mammoth, WALDEMAR JOCHELSON, 48 TRANSEAU, EDGAR, Climatic Factors Trotting Horse Sires, Age of, F. R. Tutt, J. W., Blue Butterflies of the Genus Celastrina, T. D. A. COCKERELL, 114 Variation, Categories of, S. J. HOLMES, 257; and Heredity in the Simplest Organisms, H. S. JENNINGS, 321; in the Number of Seeds per Pod in the Broom, J. ARTHUR HARRIS, 350 Vascular Anatomy and the Repro ductive Structures, JOHN M. COULTER, 219 Vegetation and Climatic Factors, EDGAR TRANSEAU, 487 VERRILL, A. E., Development of Starfishes on the Northwest American Coast, 542 Vertebrate Paleontology, 116 Vitality of Pine Seeds, W. C. COKER, 677 WARD, HENRY B., The Cestodes of Wilson, E. B., on Chromosomes and WRIGHT, ALBERT H., and ARTHUR ALLEN, Breeding Habits of Amblystoma punctatum, 687 A Monthly Journal, established in 1867, Devoted to the Advancement of the Biological Sciences with Special Reference to the Factors of Organic Evolution and Heredity CONTENTS OF THE OCTOBER NUMBER The Non-muscular Articulations of Crinoids. AUSTIN HOBART CLARK On Some Dinichthyid Armor Plates from the Marcellus Shale. BURNETT SMITH. Are Species Realities or Concepts only. Professor J. H. POWERS. Shorter Articles and Discussion: A Light Weight, Port able Outfit for the Study and Transportation of Ants. EDITH N. LUCKINGHAM. Comparison of Canolestes with Polyprotodonta and Diprotodonta. PAULINE H. DEDERER. Notes and Literature: Comparative Psycholoy - Bohn's "The Birth of Intelligence": Professor H. S. JENNINGS. Mammalogy-Osgood's Revision of the Mice of the Genus Peromyscus, Dr. J. A. ALLEN, LEO ERRARA, Professor CHARLES E. BESSEY. Single Number 35 Cents Yearly Subscription, $4.00 The NATURALIST will be sent to new subscribers for four months for One Dollar THE SCIENCE PRESS Garrison, N. Y. Sub-Station 84: NEW YORK Lancaster, Pa. T By IRVING HARDESTY 196 pages, 8vo, cloth; net $1.75, postpaid $1.87 NTENDED to serve as an introduction and laboratory guide to the study of the architecture of the nervous system, containing a succinct account of methods which have stood the test of practical application. 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