GENERAL NOTES 141 



equaled, and never excelled in certain direc- 

 tions, never used an eyepiece in making his 

 world-famous negatives. He worked within 

 his camera, from which every ray of light 

 was excluded that did not pass through the 

 microscope. His lenses were perfectly cor- 

 rected in themselves, and did not require 

 completion by means of a compensating or 

 projection ocular, as do the present-day apo- 

 chromats. Had he elected to use an eye- 

 piece, it must perforce have been one of the 

 Huyghenian form, which alone were available 

 in his time. Fortunately the judgment which 

 led him to discard the ocular was not at 

 fault, since the photographic image projected 

 through one of this form is decidedly inferior 

 in sharpness and brilliancy to that produced 

 by means of a well-corrected achromatic ob- 

 jective alone, especially in high powers. With 

 apochromats and compensating oculars, how- 

 ever, the results are reversed, very many 

 objects being resolved with a sharpness and 

 brilliancy quite beyond the reach of the best 

 achromats. Doubtless, if Dr. Woodward was 

 living and working at the present time, it 

 would not be in the darkness of his former 

 work-room camera, but with the modern ap- 

 pliances in the clear light of day. 



