80 SEVENTEENTH REPORT. 



Coiintorstaiii on Mie slide with Lvoiis bine to wliicli sutticieiit piric 

 acid has been added to turn it green. 



In early stages the borax carmine may not stain the nnclei with 

 sufficient intensity. These stages may be stained in bulk in para- 

 carmine, which should be washed out with 1% acetic acid ; or the 

 embryos may be stained on the slide with Delatield's haemotoxylin 

 and couuterstaiued with Orange G. 



Zoological Laboratory, 



State Normal College, 

 Ypsilanti, Mich. 



