The Staining of living Nuclei. 581 



4. That wilh certain violet aniline colors, viz. dahlia, mauvein, and 

 methyl-violet, it is possible to color the nuclei of living plant-cells. 



2. Both resting and dividing nuclei may be Ihus stained in life. 



3. The nuclei of both vegetative and reproductive cells may be thus 

 stained. 



The foregoing sketch lays no claim to completeness. Owing to the very 

 limited time at the author's disposal it was impossible to exaraine a number 

 of plants, that would undoubtedly have given interesting and valuable re- 

 sults. Nevertheless it is hoped that the results given are sufficient to call 

 attention to the possibilities of the subject and to stimulate others to in- 

 vestigate the matter further. 



In conclusion I must express my grateful appreciation of the kind- 

 ness and valuable assistance received during the pursuance of the work 

 from Professor Pfeffer, under whose supervision the investigations were 

 made. 



Tübingen, August 1887. 



38' 



