300 J. J. Woodward on the Magnesium and 
bert’s plate, &,) for which it is not necessary to employ a 
stonked 
three minutes for one thousand diameters. Other powers require 
poportional times. 
serves admirably for the production of photographs of the soft 
tissues with any power under a thinapasiel 
being composed of a mixe pencil, with rays passing in 
directions, there are no interference phenomena 
€ process employed by me in the production of negatives 
with the magnesium light, i i 
: 1e cope, (c) which stands on a table (e) supported 9 
a. ee le vellin — The image received on the siete ve 
___ @ which is supported on a table, (/) is photographed precisely 
