On the Sivatherium giganteum. 193 



The conclusion, however, as stated by me was that they have 

 all the same specific heats under equal weights ; and this error 

 I fell into from omitting, in my hurry, (most of my calculations 

 were made on the day preceding the meeting of the Asso- 

 ciation,) to divide by the specific gravities, or, in other words, 

 applying to all the formula for atmospheric air, in which the 

 specific gravity being unity does not appear. Dr. Hudson, 

 however,who would seem to have a passion for repeating my cal- 

 culations, and a good deal of leisure, it is to be presumed, when 

 he devotes himself to so uninteresting an occupation, observed 

 this omission (a venial one I trust, and one which I hope I am 

 not vain in thinking I should, on returning to the subject, 

 have been able to remedy without Dr. Hudson's assistance,) 

 and informed me of it. For this communication I felt thank- 

 ful, and on a subsequent occasion, I believe, so expressed my- 

 self; but I was not I confess aware at the time that Dr. Hud- 

 son, after supplying the omission in question, had forwarded 

 a paper to the Philosophical Magazine, entitled, " On an error 

 in Dr. Apjohn's formula for inferring the specific heats of dry 

 gases *." This course it was undoubtedly perfectly competent 

 to Dr. Hudson to take, and I would not wish to be understood 

 as complaining of it: however anxious to protect myself 

 against misrepresentation, I feel no disposition to contest with 

 him the credit which he may be conceived to have acquired 

 from the proceeding under consideration. 



28, Lower Eaggott-Street, Dublin, JamES Apjohn. 



July 5, 1836. 



XLI. On the Sivatherium giganteum, a new Fossil Ruminant 

 Genus,fron the Valley of the Markanda^ in the Sivdlik branch 

 of the Sub-Himalayan Mountains. By Hugh Falconer, 

 M.D., Superintendent Botanical Garden, Seharanpur, and 

 Captain P. T. Cautley, Suj)erintendent Doab Canal.f 



[With an Engraving: Plate II.] 



THE fossil which we are about to describe forms a new accession to 

 extinct Zoology. This circumstance alone would give much interest 

 to it. But in addition, the large size, surpassing the rhinoceros, the family 

 of Mammalia to which it belongs, and the forms of structure which it ex- 



ments of Dulong, Haycraft, Marcet and De la Rive, Dr. Hudson seems to 

 speak of as originating with himself. " Accordingly the experiments, ex- 

 cept with hydrogen, rather favour my view that the capacities of gases 

 are e()ual in equal volumes." (See Phil. Mag. for January 1836, p. 22.) 



* [If we remember right. Dr. Hudson's paper as we received it had no 

 title, that which it now bears, as above, having been prefixed to it by 

 us. — EniT.] 



f From the Asinlic Researches: Transactions of the Ihysical Class of the 

 Asiatic Society of Bengal, Part iii. 



Third Series. Vol. 9. No. 53. Sept. 183G. Y 



