62 



SCIENCE 



[N. S. Vol. XLII. No. 1071 



4. Parthenocarpy and Parthenogenesis in Nico- 

 tiana: T. H. Goodspeed, Department of 

 Botany, University of California. 



Mrs. E. H. Thomas found frequent cases of 

 parthenogenesis in Nicotiana; but other ex- 

 perimenters have been unable to verify these 

 results. The present investigation, conducted 

 upon the particular strains of tobacco of which 

 seeds were furnished by Mrs. Thomas, shows 

 that in those strains parthenocarpy is a fre- 

 quent occurrence and that parthenogenesis is 

 also peculiar to this variety. 



5. Exogamy and the Classificatory System of 

 Relationship: R. H. Lowie, American Mu- 

 seum of Natural History, New York City. 

 The exogamous factor must have been a real 



cause in moulding the kinship terminology of 

 at least some so-called classificatory system. 

 This conclusion is reached by a study of the 

 character of two Siouan tribes, the Crow and 

 Hidatsa. 



6. Solution of an Infinite System of Differ- 

 ential Equations of the Analytic Type: 

 F. E. MouLTON, Department of Astronomy, 

 University of Chicago. 



If the number of mutually gravitating bodies 

 in the universe is infinite, and if beyond a 

 finite number of them their initial distances 

 from one another increase with sufficient 

 rapidity as the number of bodies increases, 

 there is a rigorous, though limited, solution of 

 the problem of infinitely many bodies. 



7. Sex Ratio in Pigeons, together with Oh- 

 servations on the Laying, Incubation and 

 Hatching of the Eggs : L. J. Cole and N. F. 

 Kjekpateick, College of Agriculture, Uni- 

 versity of Wisconsin. 



A seven-years' study of inheritance in pi- 

 geons leads to the conclusion that the normal 

 ratio of the sexes of pigeons hatched is 105 

 males to 100 females; that the number of uni- 

 sexual broods exceeds the number of bisexual 

 broods; that there is no tendency for first- 

 laid eggs to hatch males and second-laid eggs 

 to hatch females; that there is a correlation 

 between the time of hatching the second egg 

 and that of laying the first; that the birds 

 continue to set beyond the normal period of 

 incubation if the eggs do not hatch. 



8. Vividijfusion Experiments on the Ammonia 

 of the Circulating Blood: A. Rohde, De- 

 partment of Pharmacology, Johns Hopkins 

 Medical School. 



The generation of ammonia in shed blood 

 occurs in the non-diilusible constituents of the 

 blood. 



9. 126 Parabolic Orbits of Meteor Streams: 

 C. P. Olivier, Leander McCormick Obser- 

 vatory, University of Virginia. 

 Although the most important feature of this 



investigation is the calculation of 126 para- 

 bolic orbits, the most interesting result is the 

 final proof of the connection of the Haley's 

 and -q Aquarid meteors. It is further con- 

 cluded that radiants are not stationary. 



10. The Basal Silurian Formations of Eastern 

 North America: C. Schucheet, Peabody 

 Museum, Yale University. 



Medina, Cataract and Brassfield are to be 

 retained as names for independent marine 

 faunas and formations. 



11. A Method of Obtaining Complete Germina- 

 naiion of Seeds in (Enothera and of Record- 

 ing the Residue of Sterile Seed-like Struc- 

 tures: B. M. Davis, Department of Botany, 

 University of Pennsylvania. 



By sowing seeds upon pads of filter papers 

 placed in Petri dishes and thoroughly soaked 

 and by keeping the culture under unvariable 

 temperatures rapid germination was obtained. 



12. The Osmotic Pressure of the Ions and of 

 the Undissociaied Molecules of Salts in 

 Aqueous Solution: Stuart J. Bates. 

 Throop College of Technology, Pasadena. 

 The author shows how the partial osmotic 



pressures of the ions and of the unionized 

 molecules can be calculated by thermodynamic 

 principles from the freezing-points and con- 

 ductance-ratios at a series of concentrations. 

 The results show that in general the osmotic 

 pressure of univalent ions is considerably 

 smaller and that that of the undissociated mol- 

 ecules is very much larger than would be re- 

 quired by the osmotic-pressure law of perfect 

 solutions. 



13. The Extension of the Spectrum beyond the 

 Schumann Region: Theodore Lyman, Jeffer- 



