CHAP. XL.] ANTI-WAR DEMONSTRATION. 365 



many of these extinct mammalia, amounting in some 

 cases, as Dr. C. T. Jackson has ascertained by ana 

 lysis, to 27 per cent., so that when all the earthy 

 ingredients are removed by acids, the form of the 

 bone remains as perfect, and the mass of animal mat 

 ter is almost as firm, as in a recent bone subjected to 

 similar treatment. It would be rash, however, to 

 infer confidently from such data that these quadru 

 peds were mired at periods more modern than the 

 fossil elephants found imbedded in similar clayey de 

 posits in Europe, for the climate prevailing in this 

 part of America may possibly have been colder than 

 it was on the eastern side of the Atlantic. At the 

 same time, I have stated in my former &quot; Travels,&quot; * 

 that all the mastodons whose geological position I 

 was able to examine into, in Canada and the United 

 States, lived subsequently to the period of erratic 

 blocks, and the formations commonly called glacial. 

 I have also shown that the contemporary freshwater 

 and land shells were of such species as now live in 

 the same region, so that the climate could scarcely 

 have differed very materially from that now prevail 

 ing in the same latitudes. 



During my stay at Boston, as I was returning one 

 evening through Washington Street, I fell in with a 

 noisy rabble of young men and boys, some of whom 

 were dressed up for the occasion in rags, and pro 

 vided with drums, sticks, whistles, tin-kettles, and 

 pans, with other musical instruments, most of them 

 on foot, but some mounted and sitting with their 



* Vol. I. pp. 51, 55. Yol. II. p. 60. 

 R 3 



