116 Botanical Microtechnique 



followed by a mild and slow dehydrating method, and progressive 

 infiltration, yields the most satisfactory ratio of good o\ ides. 



The foregoing discussion of the criteria of the quality of processed 

 materials was illustrated by rather extreme cases of unsuccessful proc- 

 essing, contrasted Avith some decidedly choice materials. In actual 

 practice it is not necessary to be so critical. A preparation having some 

 plasmolysis may nevertheless be presentable and usable for the study 

 of organogeny and tissue systems. At the risk of tiresome repetition it 

 will be stated again that the choice of the subject, the technique used, 

 and the quality of the finished product should suit the need. 



