336 The Botanical Gazette. [September, 
leaves, sections of wood, and all kinds of thin semitranspar- 
ent objects, including drawings and book illustrations. Dried 
leaves may be made sufficiently transparent by immersion in 
kerosene. If the object is moist, like fresh sections of fleshy 
tubers and roots, a sheet of mica can be laid between the ob- 
ject and the sensitive paper. Many beautiful examples of 
the diversified application of the process were shown. (The 
name is a fanciful compound of Sol-and-lI. 
Discussed by Mrs. E. G. Britton, W. A. Kellerman and 
A. B. Seymour, who described photographic methods which 
they had used. The last had found two sheets of glass 
clamped together, when copying from bound books, quite as 
efficient as the printing frame, thus overcoming the necessity 
of cutting out the leaf. 
. N. L. BRITTON: Present aspects of the nomenclature ques- 
tion.—The paper was presented by request and consisted sim™- 
ply of a statement of the different views held in recent times, 
with no attempt to discuss their relative merits. With refer- 
ence to genera, the various positions as to the date of ba 
recognition were grouped as follows: (1) Pre-Linnzan (nat- 
urally subdividing into those who would recognize genera 
from the earliest possible date, and those who would carry 
them back as far as Tournefort), (2) 1735, (3) 1737; (4) ae 
(5) those who would use a more recent limitation. * 
species, the two views are represented by those who yer 
recognize binomials before the time of Linnaeus, and t 
who would date them entirely from 1753. _ nd for 
Discussed by Mr. E. L. Greene, who did not conte such 
pre-Linnzan binomials, but for the practice of creer * 
names as Linnaeus adopted from former authors to the fatt 
spective authors. Mr. Seymour called attention to wre 
that this method was in use in quoting the names ‘l wie 
Fries, although in this case the authorities cited were . 
Sequent to Linnzus. i 
a T. A. WitutaMs: Lichens of the Black hae oe . 
was submitted containing eighty-three species a distribu- 
and thé paper read considered only the subject ° ck forms 
tion. Of the eighty-three species forty-five are ck remain 
eight are tree forms, twenty-one are earth forms, ee ne : 
der occupying combined localities. Comparison © |) and 
‘. . ’ < and those oO 
with the lichens of eastern Nebraska he report 
the Yellowstone Park region as published in t 
