594 The American Naturalist. [July, 
These tickets give the right to go from the frontier to the 
starting places of the excursions (St. Petersburg, Moscow, etc.), 
and to take part in all the parts of the proposed itinerary. 
Similarly the tickets will be good for the return of the 
excursionists to the frontier starting from any point where they 
wish to leave the excursions of the Congress. 
Conformably to the laws in force on the Russian railways 
the holder of gratuitous tickets are required : 
1. Not to transfer them to other persons. 
2. To present the ticket on request of the conductor of the 
train or of the management. 
3. Each ticket gives the right to the gratuitous transporta- 
tion of 1 pound (16 kilograms). ` 
The committee of organization begs each possessor of a ticket, 
to sign it himself on the back near the bottom, at the line 
marked by a red point. 
Persons who do not make use of the railway ticket sent them, 
are requested to return it to the committee by registered letter. 
To the persons arriving by Finland, the tickets for trans- 
portation on the Finnish railways will be delivered by Mr. I. 
Sedorholm, Director of the Geological Survey of Finland, and 
member of the Committee of organization. 
In the name of the general committee of organization. 
THE BUREAU. 
A. Karpinsky, President. 
Tu. TSCHERNISCHEW, General Secretary. 
RECENT LITERATURE. 
A Text-Book of Experimental Embryology.'—Professor Mor- 
gan, of Bryn Mawr College, has made the first attempt to bring the 
results of the labors of German and American experimental embryolo- 
gists into such form as may serve as an introduction to this rapidly 
growing branch of biology. The scattered and too often inaccessible 
1 The Development of the Frog’s Egg. An Introduction to Experimental 
Embryology, by Thomas Hunt Morgan. The MacMillan Co., New York, 1897, 
pps. 186, 51 figs. in text. Price, $1.60. 
