70 The American Geologist. August, i904. 
many of them inaccessible to the majority of readers, and in 
part pnbHshed in the Russian or in oriental languages. The 
series of papers by Baron v. Richtofen has been written with- 
out collaboration with Suess, yet the conclusions arrived at, 
it is a pleasure to note, are surprisingly concordant. Conclud- 
ing his second paper v. Richtofen says : 
"Though the relationships of the interior continental land-steps per- 
mit certain conclusions regarding the earliest occurrences of those tec- 
tonic movements which have determined the present forms, the same 
may not be carried out for the marginal steps, and it appears safer for 
the present to avoid any conclusions in this direction until a greater 
total of observations is furnished for comparative consideration than is 
now at hand in the generally accessible literature." 
To this he adds the important foot note : 
"Unexpectedly soon the wish implied in the concluding sentence has 
been fulfilled ; not only the opening up of otherwise not generally ac- 
cessible sources, but also their thorough correlation is furnished by a 
master hand. For after this paper was put in type and during the 
correction of the proof sheets, came the joyful surprise in receiving from 
the author the long-expected first half of the third volume of the Antlitz 
der Erde, by Edouard Suess. In it are discussed some of the problems 
which have been treated Jiere, in particular the structure of the Sikhota- 
alin and the Anamitic ranges, as smialler parts of a representation of 
the structure of the Asiatic continent in its broader aspects. I have been 
obliged to renounce with reluctance making reference to it here, and 
from the fountain of facts won from the study of the extensive Russian 
literature and the conclusions drawn from it, to supplement my own ar- 
guments. Yet I can with satisfaction state that in the few points in 
which the region of my performances touches that in the mentioned vol- 
ume, a difference of opinion regarding the comprehension of the basis 
of facts does not exist, and that in respect to the theoretical explanation. 
in particular the disjunctive processes coimected with the eastern Asiatic 
depressions, a difference of opinion regarding the essential points 
likewise does not exist." 
Ill the works of both these geologists a key -note has been 
struck by giving thought not alone to the construction of geo- 
logic sections representing parts of the crust not exposed .to 
view, but by seeking to interpret genetically the larger fea- 
tures of the surface — the tectonic lines — which are everywhere 
open to study. As Suess has expressed it the knowledge of 
the cross section is but one part of the problem, the other be- 
ing the horizontal projection — the plan. Applying this meth- 
od to the Asiatic coast he continues : 
