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. 132 



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. 133 



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- 



t82 Weismann : Neue Gedanken zur Vererbungsfrage. Eine Ant- 

 wort an Herbert Spencer. Jena, Fischer, 1895. P. 54ff. 



183 Cattaneo : 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 II, Bd. XXIX, 

 1896. P. 10 ii ; and: I fattori della Evoluzione Biologica. Genua, 

 Martini, 1897. P. 40 41. 



