46 DIATOM .WT , . 



occurs when forms in any gathering are few and far between. 

 Let such prepared material be spread upon a large slide, cover- 

 ing a space of one inch by two, and let it be filliped as it is set 

 away to dry spontaneously. With a two-third inch objective, 

 search the white field for any Diatoms whatever, and, upon 

 finding, encircle each one with a line, made with a point of a 

 match sharpened and moistened, adding near the circle a dot, 

 or cross, or other sign, always appropriated to the same 

 Diatom, and of which a tallying record is kept on paper. At 

 leisure one may, without trouble, single out any desired object, 

 pick it off w T ith a fine dampened point of cane (reed), not in- 

 cluding the siliceous cuticle, and deposit it, free from injury, in 

 a small drop of distilled water placed in the centre of the slide. 

 And here we leave our subject, with the remarks that none of 

 the methods proposed can lead to success unless aided by 

 patience, pains-taking, the adaptation of means to an end, and 

 by practiced manipulative skill; and that what appears to be 

 present perfection is only to be regarded as one of the widen- 

 ing circles which tend towards, but never reach, ultimathulan 

 truth. 



