('.. c. iii'nsT. — Tiir: Ai'i'i.icMhiN ok tiik piiincipi.ks (if gknktics. -ji!) 



roprescnl equal proportions of colomi'il ;iiid wliilr. riiid 11. 7. S ninl il rcpreseni 

 increasing excess of coloiired ovci' wliilc llicn 11 will hc nlnidsl s(>ll-ri)I()iirc(l. 

 If i, 3, 2 and I rcprosonl increasing excess of wliilc ovci- rolmirctl. IIkmi I will 

 be almost wliito. 



So Inr as niy cxpcrimenis liave gone, àx'» gives I, '2. 7>, a, (J, 7, and ^ ihc 

 lypes i and 'J being absent. Now 1, 'i and 5 breed Inie lo I, 2 and .", giving 

 no liigber form. Consequently o, C, 7 and 8 being dominant to I, t! and T), pure 

 dominants can ])e raised carrying no low numbers. Stops are being taken to 

 raise tbese bomozygous lines tliat will not throw the spolted wasters. Pro- 

 fessor Piinnetl of Camltridge bas rccently been good enough to scnd me a pair 

 of chocolaté rabl)ils, w illi tho nbjccl <>[' inlnidiiciiig Ihis new and siriking cDloiir 

 inlo (lie Dulcb breed. 



Ilorsps. — A study of the General Slud Bouk and Uacing Calendar bas 

 revealed the existence of scveral Thoronghbred mares and slallions. which 

 \\hen bred together give nothing Imt steeplcchasers. 



In vicw of tliis fortnnate (Ind ofwbat is apparenlly a bomozygous line of 

 cliasers, sieps are being Iakeli lo purchase mares and stallions, Ihe offspring 

 of Ihis line, for expérimental breeding. Thanks to the keen interest and kind 

 generosityof Captain Part of the 2 Ist. Lancers, it bas been possible to put 

 Ihcse Mendelian experiments into opération this season. The experiments will 

 l)e carried ont parlly at Ibis Station and partly al Caplain Part's Stud in Ilert- 

 fordshire. The l>(jard of Agriculture and Fisheries, London, bave detailed 

 their Superinteniling lns]ieclor, Mr F. \\'. Carter to watch and assist the expe- 

 riments on their behalf. It is hopcd that thèse experiments may help to solve 

 the praclical problem of the making of a bomozygous hunier. 



Expérience suggests that the hereditary faclors conci'rned in Ihe making 

 lA' a hunier or cliaser, represenl mental and temperanienlal qualities rather 

 tiian purely physical characters, as is usually supposed. 



In the hunier for example, a perfect physical confurmalion is useless 

 wiihout the « jumping tempérament », and the possession of courage in a trial 

 of endurance, is oflen a greater asset than a powerful physique. 



This parlicular case provides an illustralion of some unexpecled possibi- 

 lities in the application of the principles of Genelics lo praclical problems. In 

 this case, like many others, we bave at présent no knowledge whatever of the 

 Mendelian unils which go lo makc a chaser or a hunter. AU we know is (bat 

 certain malings produce such horses, while others do not. even with the best 

 possible training. 



There may be many gamelic unils concerned or Ibère may be but one. 



The important point is, that notwilhstanding our présent ignorance of the 

 |irecise gametic units or combinalion of units, that go to make the hunter or 

 ihaser zygote, we can still proceed to apply the principles of Genelics to the 

 practical problem of hunter-breeding with some hopes of success. In such 

 cases, the praclical application is of necessity in advance of présent knowledge, 

 and Iherefore involves Irue expérimental research. 



Man. — Pedigrees of local faniili<'s, and individual <il)servation8 of Ihe 

 colour of the eyes, hair and skin of the local population, are being rccordcd at 

 liie Station. The results so far obtained, show clearly that Mendelian segre- 



