DWARFS IN GLUVAS EARLY (WHEAT) HYBRIDS. 



547 



the parents yielding the recessive dwarfness are represented in 

 some or all classes, which may go to show that this mixed i)opula- 

 tion for height may he suhdivided into various classes, such 

 classes embracing individuals which may breed true to the 

 characteristic height. The normal class height and the dwarf 

 form may then be taken as an allelomorph. This may l3e the 

 reason for the mean height (Table I. li) for jjarents producing 

 dwarfs being greater than either the mean for those for the total 

 or for the normal { Table I, g and i) as is readily to be seen in 

 that all parents over 150. i cm. gave rise to dwarf progeny. 



Comparing the frequency curves II and \^ for ear length 

 instead of for height of plant as above-mentioned, the same indi- 

 cations are produced, and this is also the case where weight of 

 grain forms the basis as in curves III and \ I. 



In the present discussion three quantitative characteristics 

 are considered, and indications are found to show that quanti- 

 tative characteristics may become subdivided into what ma\- 

 ])erhaps be called class-allelomorphs, each such a class-allelo- 

 morph acting similar to allelomorphs in which the pairs of 

 characters have reference to qualitative characteristics. 



The reason why the present hybrid material may be the 

 criterion for more definitely translating the characteristic such 

 as height into Mendelian terms is simply because the recessive 

 dwarfness is a distinguishable characteristic, though for the 

 present it is diffictilt to give accurate dimensions of the degree 

 of dwarfness, as dwarf individuals rarely mature, in most cases 

 the ears remaining enclosed in the apical leaf sheath. 



INDUSTRIAL DEVELOPMENT. 



By Kenneth Austin, M.Am.I.^I.E. 



(Not printed.) 



THE ASCENT OF SAP IN PLANTS. 



Bv Prof. Horace Athelstan Wager, A.R.C.S. 



(Not printed.) 



X'.VRIATION IN AGERATUM CONYZOIDES 

 (FAAIILY COMPOSIT.E.) 



Bv Stephen Gottheil Rich, M.A.. B.Sc. 



(Not printed.) 



