Maech 30, 1906.] 



SCIENCE. 



499 



SCIENTIFIC JOURNALS AND ARTICLES. 



The Journal of Experimental Zoology, Vol. 

 III., No. 1 (February, 1906), contains the fol- 

 lowing papers : Edmund B. Wilson, ' Studies 

 on Chromosomes, III. : The Sexual Differences 

 of the Chromosome-groups in Hemiptera, 

 with some Considerations on the Determina- 

 tion and Heredity of Sex.' This article pre- 

 sents the final result of a comparison of the 

 chromosome-groups in the Hemiptera-heter- 

 optera, and shows that the two sexes exhibit 

 constant differences that are traceable to the 

 mode of fertilization, the spermatozoa being 

 predestined in equal numbers as male-pro- 

 ducing and female-producing forms. A gen- 

 eral discussion of sex-production in relation 

 to the chromosomes is given. David D. 

 Whitney, ' An Examination of the Effects of 

 Mechanical Shocks and Vibrations upon the 

 Rate of Development of Fertilized Eggs.' 

 Fertilized eggs of Arhacia, Asterias, Fundulus 

 and Ctenolahrus were subjected to slight and 

 violent mechanical shocks and vibrations from 

 a few seconds to several hours with no accel- 

 eration of cell division occurring in the early 

 stages, provided the temperature was kept 

 uniform. John W. Scott, ' Morphology of 

 the Parthenogenetic Development of Amphi- 

 trite.' A close comparison is made between 

 the early development of the eggs of Amphi- 

 trite and the development produced in un- 

 fertilized eggs by certain salt-solutions or 

 mechanical agitation. Charles E. Stoekard, 

 ' The Development of Fundulus Heteroclitus 

 in Solutions of Lithium Chlorid, with Appen- 

 dix on its Development in Fresh Water.' 

 Lithium chlorid in both fresh and sea water 

 solutions was found to produce characteristic 

 abnormalities in various stages of the devel- 

 opment of the fish; varying the concentration 

 of the solution varied the degree of abnor- 

 mality induced. Fundulus eggs developed in 

 fresh water more slowly than normally; only 

 a small percentage hatched and these died 

 very soon after. E. A. Andrews, ' Partial 

 Regeneration of the Sperm-receptacle in 

 Crayfish.' Removal of the phylogenetically 

 new but physiologically necessary external 

 sperm receptacle of adult female crayfish was 

 followed by regeneration of an organ very 



similar to the early larval state of the normal 

 receptacle. A. J. Goldf arb, ' Experimental 

 Study of Light as a Factor in the Regenera- 

 tion of Hydroids.' Colonies of Eudendrium 

 ramosum, under the influence of previous il- 

 lumination, regenerate hydranths, whether the 

 colony be exposed or not; when not under such 

 influence little or no regeneration takes place, 

 unless colony be exposed; and exposure of one 

 tenth to one sixth of a minute may suffice. 

 An exposure of three to five hours, though 

 generally not less than two days, is required 

 for regeneration of hydranths of Fennaria, 

 tiarella. 



The JSTovember-December number of The 

 Journal of Geology opens with a paper by 

 Dr. T. W. Stanton on ' The Morrison Forma- 

 tion and its Relations with the Comanche 

 Series and the Dakota Formation.' Dr. Stan- 

 ton says that these beds have been under dis- 

 cussion since 1877 and that the question 

 whether the Morrison formation is Jurassic 

 or Cretaceous is still to be answered. Dr. Q. 

 M. Murgoci, of the University of Bucharest, 

 contributes an article on the ' Tertiary Forma- 

 tions of Oltenia (the western part of Rou- 

 mania) with regard to Salt, Petroleum and 

 Mineral Springs.' This is illustrated by a 

 map, eleven figures and a synoptic table. The 

 concluding contribution is a discussion of 

 ' The Pleistocene Formations of Sankaty 

 Head, Nantucket,' by J. Howard Wilson. 



The American Geologist for November con- 

 tains a paper by Professor G. Frederick 

 Wright, on ' Glacial Movements in Southern 

 Sweden,' which is illustrated by one plate. 

 This is followed by W. G. Tight's article on 

 the ' Bolson Plains of the Southwest.' Mr. 

 Warren Upham discusses the ' Glacial Lakes 

 and Marine Submergence in the Hudson- 

 Champlain Valley.' Professor C. R. Keyes 

 contributes a paper on ' The Jurassic Horizon 

 around the Southern End of the Rocky 

 Mountains.' Anna I. Jonas gives a review of 

 the occurrence and origin of the known ' Ser- 

 pentines in the Neighborhood of Philadelphia ' 

 and W. O. Hotchkiss gives 'An Explanation 

 of the Phenomena seen in the Becke Method 

 of Determining Index of Refraction.' Those 



