116 M. A. AINSLIE ON NITZSCHIA SINGALENSIS^ 



even the little " flash-lamp " does admirably, on account of 

 its presenting a very small area of intense brilliancy ; but the 

 edge of a flame, although its total light may be greater, has 

 much less intrinsic brilliancy. 



Though I understand that the resolution of N. singalensis has 

 been effected by means of the light from a flame-edge, both by 

 Mr. Merlin and Mr. Nelson, I should like to warn any microscopist 

 who sets out to see these striae with this form of illumination, 

 and without the addition of the analysing prism, that he is quite 

 likely to be disappointed. 



Journ. quekelt Aticroacopicil Club, Ser. 2, Vol, XIII., No. 79, November 19IB» 



