92 THE MENDEL JOURNAL 



by the nature of the offspring of one of his half 

 brothers now serving in another Prussian Stud, 

 at Holstein. This brother is named " Holstein 

 Amurath." (Plate 2.) 



Now we desire to ascertain the gametic consti- 

 tution of this stallion by a reference to his parents' 

 origin, and from the gametic behaviour'---' of his 

 brother, "Celle Amurath." We have already seen 

 that the brother is a pure grey, because all his off- 

 spring (six hundred) have been grey. We also 

 saw reason (p. 91) to regard " Radautz Amurath," 

 the sire of "Celle Amurath," as an impure grey, bear- 

 ing in his sex-cells greyness in some and bayness 

 in the others. That being the case, the Mendelian 

 expectation for his offspring, when he is mated with 

 another impure (D R) grey, such as we saw the dam 

 of "Celle Amurath " is, will be one-half pure greys 

 and the other half impure greys. 



Now impure greys, carrying greyness and bay- 

 ness, can be tested by mating with bays. In that 

 event, both whites (greys) and bays are expected in 

 the offspring. " Celle Amurath's " half brother, 

 " Holstein Amurath," was thus mated and his off- 

 spring are some whites and some bays. | The 

 Mendelian prediction is thus fulfilled in the actual 

 results in so far as both expected types appear. 



In conclusion, I would like to add that I do not 

 treat the study of Mendelism as a hobby, but try 

 to get some deductions out of Mendel's laws which 



* Measured by the nature of his ottspring. 



■}• The number of each is being ascertained from Germany, and 

 will be published in the next number. (Editor.) 



