258 J. J. Woodward on Photographing 
its, in the most intimate contact with each other, and yet with- 
out being mutually alloyed. Even at the contact they are not 
absolutely joined together, for after rolling out a piece of cop- 
[To be continued.] 
Art. XXXIV.—On Photographing Histological Preparations by 
Sunlight; by J. J. Woopwarp, Asst. Surgeon U. S. Army. 
Report to Surgeon General J. K. Barnes, U. S. Amny. 
Washington, June 9, 1871. 
So many cloudless days are offered to the photographer m 
ra not but regret these results ; yet they 
appeared to be final at the time of writing. During the last 
few months, however, I have found improved methods of using 
photographing the soft tissues, and have 
arrived at results which must materially modify the conclusions 
If a well made preparation of some normal tissue, or of some 
ia —- wore with carmine, silver, or an = 
vemporarily in glycerine, or permanently in Can 
balsam, be illuminated by White cloud i easnstin, by ae 
light, and found to be all that could be desired, it will nev | 
theless oe very unsatisfactory if illuminated by the direct 
sun, : 
rays of 
