i'^' INTRODUCTION. 



part collie under our own observation. Portraits of 

 the aniinals, painted by tbe accurate Agasse are pre- 

 served in the Museum of Surgeons College^ London. 

 , We represent the 1st 2nd and even 3rd produce of 

 this mare and black Arabian, where these marks 

 are all conspicuous. In the last foal the mane retains 

 its Quagga character as much as in the first, and in 

 all the streaks on neck and back are more decided 

 than even in the mule ; which we shall figure when 

 the Nat. history of Mules is considered. 



It has been remarked on this tendency of the dur- 

 ation of characters belonging to the first male parent, 

 however different he may have been in form or colour, 

 that it recurs in the dog and hog, but Mr. Bell does 

 not attempt furthur to account for it, although the 

 question is of still stronger import, since, in the case 

 of the mare, the first male was of a different species, 

 and not of the same ; as according to his authority, 

 dogs and hogs are, when subject to these effects. 

 .We, on the contrary, having already noticed this 

 .question in the history of the dogs, and adduced the 

 example of hogs, to prove a plurality of homogeneous 

 forms in both, regard the facts above recorded as iu" 

 dicating a plural origin exceeding the limits of even 

 .our own inferences. 



Mr. Macdonald's remarks, which we know only 

 from an abstract in the Athenaeum No. 612, 1839, 

 refer the phenomena described in Lord Morton's 

 communication to a possible cross in the progenitors 

 of the mare with an Eelback dun, which is always 

 marked with a streak on the back, and not unfre- 



