1132 Scientific News. [ Dec, 
posure of six to eight minutes. Very thin, transparent sections 
require less time than thick or deeply-stained ones. 
The pictures are, of course, negative, but they are none the 
less valuable for the purposes before named. If positive pictures 
are desired these are easily obtained, as the photographic paper 
is sufficiently transparent to admit of copying. For this purpose 
lamp-light is better than sunlight, and an exposure of one-half 
to one minute is sufficient. Both the negative pictures and the 
positive copies admit of further finish with pencil or color. 
ull details of manipulation are furnished with each package 
of the Eastman paper. The operations which follow exposure 
are (1) softening of the paper in water; (2) development of the 
picture by means of potassium oxalate and ferrous sulphate ; 
(3) washing in acidified water; (4) fixation through hyposulphite 
of sodium; (5) washing and drying. ei 
SCIENTIFIC NEWS. 
—In the November number of the American NATURALIST 
Mr. J. F. James kindly calls my attention and that of the general 
public to what seems to be a slight put upon his work. A word 
of explanation seems to be due both to Mr. James and myself. 
The object of the paper entitled “ Origin of the Indiana Flora 
was simply to apply well-known facts with regard to the No 
American flora to the specific case of Indiana. In order to do 
sary for the scientific public. My former assistant, Mr. Thom- 
son, was asked to look up the literature of the subject and pre- 
pare as compact a statement as possible of the known ene 
suppose that he found Mr. James’s paper useful, as being č 
most concise compilation of facts so well known as to have 
come general property. That due credit was not given” 
James for this assistance was a great oversight, but that it cov 
not have been intentional appears in the very extracts that Mr. 
James has culled out. He is there mentioned by his i’ aM 
as an authority for some statement or other. I am blamewo ei 
for not more closely inspecting this part of the work, but, a> is 
chief trouble was failure to give full credit to Mr. James, 5 im 
"hereby done, with an expression of regret that the omission W 
not seen in time to remedy it— Hohn M. Coulter. 
—The Imperial University of Japan has recently establishe’ 5 
marine biological station at Misaki, a day’s journey from paak 
an account of which has recently been published by Pro T 
_ Milsukuri in vol. i. of the Yournal of the College of Science © 
