Nature . reproduced at theSt. Louis Exposition. This animal, a male, measured74 feet S inches from the notch of the flukes to the tipof the nose. The approximate weight of the bones was17,920 pounds. The entire animal was estimated at notmuch less than 63 tons. Our estimate of the weight of Brontosaurus is based ona model by Mr. Charles R. Knight on a one-sixteenth scale,founded upon the actual measurements of the presentskeleton. As carefully estimated by Mr. W. K. Gregory 284 NA TURE [January 18, 1906 and Prof. William Hallock, of the physical department ofColumbia University, the Brontosaur


Nature . reproduced at theSt. Louis Exposition. This animal, a male, measured74 feet S inches from the notch of the flukes to the tipof the nose. The approximate weight of the bones was17,920 pounds. The entire animal was estimated at notmuch less than 63 tons. Our estimate of the weight of Brontosaurus is based ona model by Mr. Charles R. Knight on a one-sixteenth scale,founded upon the actual measurements of the presentskeleton. As carefully estimated by Mr. W. K. Gregory 284 NA TURE [January 18, 1906 and Prof. William Hallock, of the physical department ofColumbia University, the Brontosaurus displaced 34J tonsof water. If the animal was slightly heavier than thewater which it displaced, say 10 per cent., it would weigh38 tons. Prof. Hallock thinks that an estimate of from35 tons to 40 tons would be very near the truth, evenallowing for errors of restoration. Skull of the British Association .it the Cambridge meetingthe remarkable deposit of dinosaur remains known as tin-. Model, Bone Cabin Ouarry was described. The quarry, whichlies about nine miles north of the Como Bluffs, west otthe Rockies in south-central Wyoming, is believed torepresent a delta or mud and sand bar formation, in whichwere accumulated more or less complete remains of all thedinosaurs of the period. One of the most rare and welcome products of thisquarry in the continuous workings which began in 1897and were recently completed have beenthe series of skulls, because the skull isthe rarest and most fragmentary part ofany of the Jurassic dinosaurs. They in-clude one complete and two incompleteskulls of Diplodocus, two complete skullsof the carnivorous AUosaurus, one ofOrnitholestes, the supposed bird-catchingdinosaur, one of Laosaurus, a primitiveiguanodont, one complete skull and por-tions of two other skulls of last is herewith described and 1 < 1 for the first time. It was foundat the end of a series of cervical vertebra;by Dr. W. D. Matthew in


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