the types of dinosaurs that have since become famous.

I joined Professor Lakes at the Morrison quarry in early September of
1877, and helped dig out some of the bones of _Atlantosaurus_. A few
weeks later I was sent to Canyon City to help Professor Mudge, my old
teacher, and Mr. Felch, who had begun work there in the famous "Marsh
Quarry". It was here that we found the type of _Diplodocus_.

The hind leg, pelvis and much of the tail of this specimen lay in very
orderly arrangement in the sandstone near the edge of the quarry, but
the bones were broken into innumerable pieces. After consultation we
decided that they were too much broken to be worth saving--and so most
of them went over into the dump. Sacrilege, doubtless, the modern
collector will say, but we did not know much about the modern methods
of collecting in those days, and moreover we were in too much of a
hurry to get the new discoveries to Yale College to take much pains
with them. I did observe that the caudal vertebrae had very peculiar
chevrons, unlike others that I had seen, and so I attempted to save
some samples of them by pasting them up with thick layers of paper.
Had we only known of plaster-of-paris and burlap the whole specimen
might easily have been saved. Later, when I reached New Haven, I took
off the paper and called Professor Marsh's attention to the strange
chevrons. And _Diplodocus_ was the result.

[Illustration: Fig. 44.--The first dinosaur specimen found at
Bone-Cabin Quarry. Hind limb of _Diplodocus_.]

My own connection with the discoveries of these old dinosaurs
continued only through the following summer, in Wyoming, when we added
the first mammals from the hills immediately back of the station, and
the types of some of the smaller dinosaurs, and when we explored the
vicinity for other deposits, on Rock Creek and in the Freeze Out
Mountains.

How many tons of these fossils have since been dug up from these
deposits in the Rocky Mountains is beyond computation. My prophecy of
hundreds of tons has been fulfilled; and they are preserved in many
museums of the world.

S.W. WILLISTON.

THE DINOSAURS OF THE BONE-CABIN QUARRY.[20]

_By Henry Fairfield Osborn._

One is often asked the questions: "How do you find fossils?" "How do
you know where to look for them?" One of the charms of the
fossil-hunter's life is the variety, the element of certainty combined
with the gambling element of chance. Like the p