1998 



Journal of Applied Microscopy 



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Fig. 2. — Proboscis of Blow Fly. B. & L. -3 objective; Series I Huyghenian 



eye-piece. 



plate-holder and provided at the front end with a fixed focus lens of ten inches 

 focus, so that the amplification and definition of the image in the photograph 

 will be exactly what would be calculated for the microscope image, and so that 

 the definition will be equal to that seen in the microscope. A camera thus con- 

 structed, when applied to the eye-piece of the microscope at the eye-point, will 

 reproduce the image seen in the microscope, correct in definition and amplifica- 

 tion, provided the microscope has been focused with a normal eye and that the 

 photograph is made by the action of the same light rays, which should be mono- 



FiG. o. — Pleurosignia angulatum, .\ 2:!T.'3. Enlarged direct from negative. 



