Febeuaet 27j 1920] 



SCIENCE 



217 



The results of the exti/rpation of the thyroid and 

 of the pituitary anlagen on the suprarenal tissue 

 in Bana pipiens: Alice L. Brown, Kansas State 

 Agricultural College. (Introduced by B. M. 

 Allen.) 



Cytology 



*The effect of hypotonic and hypertonic solutions 

 on fibroblasts of the embryonic cMck heart in 

 vitro : M. J. Hogde, school of hygiene and public 

 health, Johns Hopkins University. 



*Coelenterates and the evolution of germ cells: 

 George T. Haegitt, Syracuse TJniversiity. 



Cytological criteria for the determination of 

 Amoebic cysts in man: S. I. Kornhauseb, Deni- 

 son University. 



The spermatogenesis of Anolis caroUnen-sis : The- 

 OPHILUS S. Painter, University of Texas. 



The presence of a longitudinal split in chromosomes 

 prior to their union in parasynapsis : W. K. B. 

 EOBEBTSON, University of Kansas. 



Chromosome studies in Tettigidw. II. Chromosomes 

 of BB, CC and the hybrid BC in the genus 

 Paratettix: Mart T. Haeman, zoology depart- 

 ment, Kansas State Agricultural College. 



Parasitology 



Notes on the life-cycle of two species of Acantho- 

 cephala from fresh-water fishes: H. J. Van 

 Cleave, University of Illinois. 



On the life-history of the gape-worm {Synagamus 

 trachealis) : B. H. Ransom, U. S. Bureau of 

 Animal Industry, Washington, D. C. 



A new bladder fiuke from the frog: John E. 

 GuBERLET, Oklahoma Agricultural Experiment 

 Station, Stillwater, Okla. 



Studies on the development of Ascarida perspidl- 

 lum, parasitic in fowls : James E. Ackeet, Kan- 

 sas State Agricultural College. 



*New data bearing on the life-history of Sarco- 

 cystis tenella: John W. Scott, Undversity of 

 Wyoming. 



Contributions to the life-history of Gordius robustus 

 Leidy: H. 6. May, Mississippi College. 



Leucochloridium problematicum n. sp.: Thomas 

 Byed Magath, Mayo Clinic. (Lantern.) 



Two new genera of Acanthocephala from Venezue- 

 lan fishes: H. J. Van Cleave, University of 

 Illinois. 



*Note on the behavior of embryos of the fringed 

 tapeworm: John W. Scott, University of Wy- 

 oming. 



Contributions to the life-history of Paragordius 

 varius {Leidy) : H. G. Mat, Mississippi College. 



Geneitics 



Selection for increased and decreased bristle num- 

 ber in the mutant strain "reduced" : F. Payne, 

 Indiana University. 



The mutational series, full to bar to ultra bar, in 

 Drosophila: Charles Zeleny, University of 

 Illinois. 



Variation m the percentage of crossovers and se- 

 lection: J. A. Detlefsen and E. Egberts, Col- 

 lege of Agriculture, University of Illinois. 



Inheritance of color in the domestic turlcey: W. E. 

 B. EoBEETsoN, University of Kansas. 



Seredity of orange eye color: F. Payne and Mar- 

 garet Denny, Indiana University. 



The tabulation of factorial values for eye-facet 

 number in the bar races of Drosophila: Chaeles 

 Zelent, University of Illinois. 



LinJcage of genetic factors in mice: J. A. Det- 

 lefsen and E. Egberts, College of Agriculture, 

 University of Illinois. 



Forty-two generations of selection for high and 

 low faoet number in the white bar-eyed race of 

 Drosophila: Charles Zelent, University of 

 Illinois. 



On the inheritance of congenital cataract in dairy 

 cattle: J. A. Detlefsen and W. W. Yapp, Col- 

 lege of Agriculture University of Illinois. 



Ecology and General Physiology 

 Observations on the habits of larval colonies of 

 Fectinatella: Stephen E. Williams, Miami 

 University. 

 Animal aggregations: W. C. Allee, Lake Forest 



College. 

 Behavior of the larvce of Corethra punctipennis 

 Say: Chaunoey Jubat, Wisconsin Natural His- 

 tory Survey. 



* Studies on chitons: W. J. Ceoziee, Hull Zoolog- 



ical Laboratory, University of Chicago. 



*0n the natural history of Onchidium: Leslie B 

 Arey and W. J. Ceozier, Northwestern Univer 

 sity. University of Chicago. 



*Ihe olfactory sense of Orthoptera: N. E. Mc 

 Indoo, Bureau of Entomology, Washington 

 D. C. 



On a new principle underlying movement in organ- 

 isms: A. A. Schaefper, University of Tennessee, 



The relation of the concentration of oxygen to the 

 rate of respiratory metabolism in Planaria: B, 

 J. Lund, Laboratory of General Physiology, 

 University of Minnesota. 



* Experimental studies on the cerebral cortex and 



