Journal of experimental zoology . cells multinuclear; diffuse chromatin stain near center of egg indicates original position of thegerminal vesicle. Age, four hours and forty-two minutes. Leitz oc. 3, obj. 1-12. Fig. 63. Several vesicles in each cell; cleavage planes complete. Age, four hours and forty-twominutes. Leitz oc. 3, obj. 1-12. Fig. 64. Egg showing typical cleavage. Mitotic Bgure in one cell; more than one nuclear vesiclein others; part of segmentation cavity present. Age, eight hours and forty-seven minutes. Leitzoc. 3, obj. 1-12. Fig. 65. Egg typical of incomplete cleavage with pro
Journal of experimental zoology . cells multinuclear; diffuse chromatin stain near center of egg indicates original position of thegerminal vesicle. Age, four hours and forty-two minutes. Leitz oc. 3, obj. 1-12. Fig. 63. Several vesicles in each cell; cleavage planes complete. Age, four hours and forty-twominutes. Leitz oc. 3, obj. 1-12. Fig. 64. Egg showing typical cleavage. Mitotic Bgure in one cell; more than one nuclear vesiclein others; part of segmentation cavity present. Age, eight hours and forty-seven minutes. Leitzoc. 3, obj. 1-12. Fig. 65. Egg typical of incomplete cleavage with probably later fusion. Nuclei vary greatly insize. Age, eight hours. Leitz oc. 3, obj. 1-12. Fig. 66. Typical of eggs with no cleavage. A few large nuclei; large vacuoles. Age, twentyhours. Leitz oc. 3, obj. 1-12. Fig. 67. One of the most advanced types of cleavage found in this solution. Evident invaginationof the mesoderm. Age, twenty hours. Leitz oc. 3,obj. 1-12. PARTHENOGENETIC DEVELOPMENT OF AMPHITRITE. John W. Scott. PLATE The Journal of Experimental Zoology, Vol. hi. THE DEVELOPMENT OF FUNDULUS HETEROCLI-TUS IN SOLUTIONS OF LITHIUM CHLORID,WITH APPENDIX ON ITS DEVELOPMENT INFRESH WATER BY CHARLES R. STOCKARD With Nineteen Figures The eggs of Fundulus heteroclitus are hardy and, therefore,stand experimental treatment most satisfactorily. Since theyare capable of development in both salt and fresh water it ispossible to eliminate all of the physical effects of hypertonicsolutions, for effective solutions of a salt may be applied in freshwater that have a final pressure lower than that of normal seawater. Mathews has stated that the eggs of this fish aFe pecu-liarly adapted to treatment with solutions because they appearto be easily penetrated by nearly all sorts of ions, and they arequite insensitive to variations in osmotic pressure of the this statement is absolutely true or not there can be littledoubt of the fact that the ions resulting from LiCl in
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
