Scientific Proceedings. 



47 



matic figure in mitosis, with special reference to the morphology 

 and cycle of the centrosome. 



Preparation I. — Metaphase of the first polar mitosis with two 

 centrioles at each pole (egg of Cerebratulus). 



Preparation II. — Sperm nucleus with sperm aster, in which 

 each daughter centriole has acquired a new system of rays (egg of 

 Cerebratulus). 



Preparation III. — Anaphase of the first cleavage mitosis, 

 showing two centrioles in each centrosome (egg of Cerebratulus), 



Preparation IV. — Telophase of the first cleavage mitosis, 

 showing typical centrosomes (egg of Ascaris, Professor Wilson's 

 preparation). 



Preparation V. — Mitosis without chromosomes in a late blas- 

 tula (egg of Asterias, unfertilized and etherized). In one of the 

 blastomeres the aster is dividing, forming a typical central spindle, 

 but devoid of chromosomes. 



Preparation VI. — Cytasters (egg of Asterias, unfertilized and 

 etherized). Many cytasters are found in the cytoplasm, some 

 dividing, some forming synthetic triasters. 



Preparation VII. — Cytasters (egg of Cerebratulus , unfertilized 

 and treated with a solution of calcium chlorid). Many cytasters 

 have appeared, the first polar mitosis being disturbed. 



46. " The influence of subcutaneous injections and of instilla- 

 tions of adrenalin upon the pupils of frogs," with demon- 

 strations : S. J. MELTZER and CLARA MELTZER AUER. 



Many observers have established the fact that subcutaneous 

 injections as well as instillations of adrenalin exert no influence 

 upon the width of the pupil in normal mammals. In a series of 

 experiments published recently by the authors of this report it was 

 shown that from 24 hours to 48 hours after the removal of the 

 superior cervical ganglion, a subcutaneous injection or an instilla- 

 tion of adrenalin caused considerable dilation of the pupil, which 

 lasted an hour or longer. 



In the present communication the authors report that in frogs 

 a subcutaneous injection or an instillation of adrenalin into the 

 conjunctival sac causes an unmistakable dilation of the pupils of a 

 normal animal. The dilation lasts a good deal longer than was 

 ever observed in mammals even after removal of the ganglion ; 



