1882 ] . Correspondence, 623 
The greatest warmth that Prussian carp can stand is 96° F., or 
2 degrees below the temperature of the human body, and a con- 
siderably greater number of degrees below the temperature of a 
warm bath. The greatest cold that this species can sustain is 
2 degrees above the freezing-point, thus limiting their range of 
temperature to 62 degrees. 
My experiments, however, have as yet been confined to 
Prussian carp.— I am, &c., 
A. Anthony Nesbit, F.C.S. 
Laboratory, 38, Gracechurch Street. 
AN ANTI-DARWINIAN ARGUMENT REFUTED. 
To the Editor of the Journal of Science . 
Sir, — A standing argument against the formation of new species 
by the preservation and accumulation of accidental divergencies 
from the original stock has been the contention that, if an indi- 
vidual possessed any structural peculiarity, such feature must 
soon disappear by successive matching with individuals of the 
normal structure. The following instance, which 1 copy from 
“ Land and Water,” proves that such disappearance is not neces- 
sarily the case : — 
“ About twelve months ago Mr. Peter Low, flesher, High 
Street, Montrose, bought a ram with four horns from a lady in 
town, which she had gained at a raffle at a church bazaar in 
Brechin. Mr. Low put the ram into a park with a black-faced 
Highland ewe, and the result was that the ewe gave birth to 
twins, male and female, on July 9th last, the ram having five and 
the ewe four horns, all well developed. The lambs are both 
strong and healthy. — N.” 
We see here that the ram, though mated with a normal ewe, 
transmitted his abnormal feature to his posterity not merely un- 
impaired, but in the one case even intensified. — I am, &c., 
Observer. 
