W. H. Brewer—Evolution of the Trotting-Horse. 303 
The material out of which this new breed is made is a lib- 
eral infusion of English Thoroughbred blood (usually more 
to mere adventitious variation and selection, I wil scus: 
The gain in speed is given in the following table, which is 
the best records at mile heats, omitting the names of the special 
performers : 
Be Best 
Date. Record Date Record. 
1818, . | 1865, 18 
1824, sae 1 yates, 2.18 
ae 2.34 1867, 2.174 
1830, 2.32 1871, 2.17 
1834, 2.31} 1872, 2.168 
1843, 2.28 i874, 2.14 
1844, 2.264 1878, 2.13} 
1852, 2,26 1879, 2.123 
1853, 2.254 1880 2.10% 
1856, 2.244 188] 2.104 
1859 2.193 
close of the preceding 
year, and since that time many lists, in one form or another, 
have been published. The figures for the animals with records 
‘iid nature of the case, the table cannot be accurate in the 
evolution, whether of a breed or species. 
orses with records of 2.40, or better, is now stated to be over 
five thousand. 
