April 1, 1904.] 



SCIENCE. 



54J 



on the very satisfactory form in which the 

 memoir appears. The arrangement of the 

 material, the typography and the character 

 of the illustrations are all worthy of favorable 

 comment. John C. Merriam. 



SCIENTIFIC JOURNALS AND ARTICLES. 



The contents of the April number of the 

 American Journal of Mathematics are as fol- 

 lows: 



Henky Lewis Rietz : ' On Primitive Groups 

 of Odd Order.' 



A. N. Whitehead: 'Theorems on Cardinal 

 Numbers.' 



T. J. I'a Bromwich: 'The Caustic, by Reflec- 

 tion, of a Circle.' 



Harry Waldo Kuhn: 'On Imprimitive Sub- 

 stitution Groups.' 



The Atnerican Journal of Psychology for 

 January contains the following articles : 



W. P. Montague : ' A Theory of Time-Percep- 

 tion.' 



Benjamin Richards Andrews : ' Auditory 

 Tests.' 



E. B. TiTCHENER: 'Some New Apparatus.' 



I. M. Bentley and E. B. Titchener : ' Ebbing- 

 haus' Explanation of Beats.' 



C. Spearman : ' The Proof and Measurement of 

 Association Between Two Things.' 



I. M. Bentley : ' Professor Cattell's Statistics 

 of American Psychologists.' 



The first number of the Journal of Com- 

 parative Neurology and Psychology as re- 

 cently reorganized appears in March with con- 

 tents as follows : ' The Relation of the Motor 

 Endings on the Muscle of the Frog to Neigh- 

 boring Structures,' by John Gordon Wilson. 

 A description with illustrations of the motor 

 nerve endings with special reference to the 

 ultra -terminal fibrils and the relation of the 

 ending to the sareolemma. ' Space Percep- 

 tion of Tortoises,' by Robert M. Yerkes. A 

 quantitative study of the amount of hesitation 

 exhibited by different species of tortoises be- 

 fore crawling over the edge of an elevated 

 board and correlation of these data with the 

 natural habits of the species stiidied. ' A 

 Note on the Significance of the Form and 

 Contents of the Nucleus in the Spinal 

 Ganglion Cells of the Foetal Eat,' by Shinki- 

 shi ITatai. A cytological examination of de- 



veloping spinal ganglion cells to determine 

 the functional significance of the centrosome, 

 aster and Nissl granules and their relations 

 to the nucleus, illustrated by two plates. ' An 

 Establishment of Association in Hermit 

 Crabs,' by E. G. Spaulding. A demonstra- 

 tion that the hermit crab is capable of pro- 

 fiting relatively rapidly by experience. Edi- 

 torials, a summary of the neurological papers 

 read at the mid-winter meetings and reviews 

 complete the number. 



The March number of the Botanical Ga- 

 zette contains a contribution from John F. 

 Garber on ' The Life History of Bicciocarpus 

 natans,' the investigation having resulted in 

 a very complete morphological study, to which 

 are appended biological data derived chiefly 

 from observation of the plant in the field dur- 

 ing one season and from experimental work 

 in the laboratory. — Mabel L. Merriman pub- 

 lishes the results of her long study of ' Vege- 

 tative cell division in Allium,' this being one 

 of the few complete studies of karyokinesis in 

 ■vegetative cells of plants. — John Donnell 

 Smith publishes his twenty-fifth paper en- 

 titled ' Undescribed plants from Guatemala 

 and other Central American republics.'^- 

 Charles Thom describes Graterellus taxophilus 

 as a new pecies of Thelephoracese. — J. M. 

 Greenman publishes notes on the indigenous 

 Centaureas of North America, describing one 

 new species. — W. J. Beal makes another con- 

 tribution to the vitality of seeds. 



SOCIETIES AND ACADEMIES. 

 THE AMERICAN PHILOSOPHICAL SOCIETY. 



The general meeting of the society will be 

 held on April T, 8 and 9, in the hall of the 

 society in Independence Square (104 South 

 Fifth Street), Philadelphia. 



Morning sessions, 10:30 a.m. to 1 p.m. 

 Afternoon sessions, 2 to 4:30. Luncheon will 

 be served in the rooms of the society from one 

 to two o'clock. A reception will be given to 

 the members and the ladies accompanying 

 them at the Free Museum of Science and Art 

 of the University of Pennsylvania on Thurs- 

 day evening, April 7. The visiting members 

 will be the guests of the resident members of 



