CONTENTS. 



PAGES. 



No. 1."). Cyclopia in the human embryo. By FRANKLIN P. MALL (3 plates, 7 text-figures). . ~> 33 

 in. Quantitative studies on niitoeliomlria in nerve-cells. By MAIX;E DEG. THURLOW 



(1 plate) . 35-44 



17. Development of connective-tissue fibers in tissue cultures of chick embryos. 



By MARGARET REED LEWIS (2 plates) 45-60 



18. Origin and development of the primitive vessels of the chick and of the pig. By 



FLORENCE R. SABIN (7 plates, 8 text-figures) . . .01-124 



19. A human embryo of twenty-four pairs of somites. By FRANKLIN PARADISE 



JOHNSON (8 plates, 9 text-figures) ... 125-lGs 



