DINOSAURS 185 
bear its armour of bony plates, the neck first, then the fore feet, 
and then the whole skeleton was specially modified to support 
it; and he concludes that as these changes took place in the 
course of the evolution of this wonderful Dinosaur, the head at 
last became so large and heavy that it must have been too much 
for the body to bear, and so have led to its destruction! This 
conclusion, if sound, is a warning against carrying “ specialisation ” 
too far. If we wished to write an epitaph on the tomb of the 
monster, it ought (according to Professor Marsh) to be, “I and 
my race died of over-specialisation.” 
After all these various efforts to improve themselves and to 
perfect their organisation so as to bring it into harmony with 
their surroundings, or “environment,” as the biologists say, it 
seems rather hard that the Dinosaurs should have been ex- 
tinguished, and their place in Nature taken by a higher type; 
but all things have their day, even Dinosaurs. 
With regard to the difficulties, hardships, and dangers attend- 
ing the discovery and transport of the remains, Professor Marsh’s 
concluding remarks may be quoted here, since they give us a 
climpse into the nature of his explorations in the far West that 
have now become so famous. He says, “In conclusion, let me 
say a word as to how the discoveries here recorded have been 
accomplished. The main credit for the work justly belongs to my 
able assistant, Mr. J. B. Hatcher, who has done so much to bring 
to light the ancient life of the Rocky Mountain regions, I can 
only claim to have shared a few of the dangers and hardships with 
him, but without his skill little would have been accomplished. 
If you will bear in mind that two of the skulls weighed nearly 
two tons each, when partially freed from their matrix and ready 
for shipment, in a deep desert cafon, fifty miles from a railway, 
you will appreciate one of the mechanical difficulties overcome. 
