1893.] MICROSCOPICAL JOURNAL. 315 



seems to take a deeper stain in many instances than in the mon- 

 aster stage. The radiating wehs heyond the pole corpuscles, ex- 

 tending out into tiie cytoplasm and forming the polar cones, 

 have not been made out in the dyaster stage. 



The chromosomes in tiie two daughter nuclei then assume the 

 basket form. The baskets formed in the two daughter nuclei 

 are easily distinguished from the basket in the initiatory stage of 

 karyokinosis by the fact that the daughter nuclei occur in pairs, 

 and each basket is much smaller than that formed in the 

 mother nucleus. The meshes in daughter nuclei are also much 

 smaller, and the chromatin is in a close tangle. 



The dyaster stage is the most conspicuous of all the stages of 

 karyokinesis in these nuclei, and most easily found. Karyoki- 

 netic figures are most abundant in eml)ryos about five milli- 

 meters in length ; in older embryos f'cy are not so easily found. 

 In examining sections from a five millimeter embryo, some 

 fields showed karyokinelic figures in fully half the nuclei. In 

 these embryos karyokinesis was ol)served in the tbllowing situa- 

 tions : 



1. Lining of primitive cerebral vesicles. Here they were 

 most abundant. Nuclei bounding the cavity showed the fig- 

 ures esjiecially well. 



2. Lining of th'- central canal of the cord. Here also very 

 abundant. 



3. Lining of the lumina of tubules of Wolffian bodies. Oc- 

 casional. 



4. Epithelium lining the pharynx. 



5. W'iihin the V)ronchial arches. 



6. Epithelium lining the bronchial clefts. 



7. Optic vesicles. 



8. Otic vesicles. 



9. Epiblast forming epidermis of face. 

 10. Walls of heart. 



Histological LABoRATORy, 



State Univkiwity of Iowa, 



October, 1893. 



To remove odors from the hands. — Flax-seed meal moist- 

 ened with water 'vill remove the smell of carbolic acid. A paste 

 of ground mustard and water will remove many kinds of odora 

 from the hands. 



