Apparent Instances and Objections 165 
were useful then. But still, in our opinion, he has not 
been able to explain correctly why these peculiarities are 
retained only in the Punjabi, who are also the only ones 
of all the tribes of the same family who are accustomed 
to squat in this way.1%? 
One could bring up also as examples the callosities 
at the knees and sternum which are hereditary in the 
domestic camels but are lacking in the wild camels. Thus 
for example the camels of the tame stock of San Rossore 
near Pisa (Italy) are covered with hair both over the 
breast bone and on the knee at birth, but after a few 
days they lose the hair in the breast bone region, which 
is then permanently replaced by a horny plate. Every 
camel up to three months old had these more or less 
broad, hairless plates, though they still retained the hair 
on the knee, but the thickened and hardened skin could 
be felt under it. Of course these camels which were 
only a few months old were not required to do any 
work. On wild camels, on the contrary, no such swellings 
are to be found either in the very young or the adult.'%? 
Still more remarkable is the following fact reported 
in 1888 by Prof. Fogliata. “A she ass from the Tuscan 
Appenines, which long had borne the pack saddle, showed 
on the back and on both sides over the ribs, a very 
evident pad of soft fat, which in extent and shape was 
like those which the pressure of an ordinary mountain 
pack saddle produces. This she ass was put to an ordi- 
182Weismann: Neue Gedanken zur Vererbungsfrage. Eine Ant- 
wort an Herbert Spencer. Jena, Fischer, 1895. P. 54ff. 
188Cattaneo: Le gobbe e le callosita dei cammelli in rapporto colla 
questione della ereditarieta dei caratteri acquisiti. Estratto dai Ren- 
diconti del R. Istituto Lombardo di sc. e lettere. Serie IJ, Bd. XXIX, 
1896. P. 10-11; and: I fattori della Evoluzione Biologica. Genua, 
Martini, 1897. P. 40—41. 
