[From the BCH.OTX or TH* TGMT BoTAjncAi. CLC 45: 109-119, aa Mk 191*.) 



Correlation of morphological variations in the seedling of 

 Phaseolus vulgaris 



J. AKTHUK HARJUS AND B. T. AVERT 



INTRODUCTORY REMARKS 



During the past several years one of us has had under way 

 e experiments on the differential death-rate of bean seed- 

 fiiE. Individuals differing in structure also differ in their capa- 

 cil for survival under field conditions.* and in such physiological 

 chracteristics as capacity for the development of the tissues of the 

 pmordialf and of the subsequent lea 



Some tens of thousands of seedlings of known morphological 

 chracteristics have been exposed to risk, as the life insurance 

 stasticians express it, in an attempt to determine the selective 

 raie of the various morphological variations. These seedlings 

 sne, for technical reasons, necessarily planted in the field at a 

 tue when the cotyledonary node and the primordial node only 

 ccld be studied. It is evident that the capacity of the plant for 

 sivival may be in some degree dependent upon characters de- 

 voped later in ontogenesis, but correlated with characters of the 

 fit or second node of the seedling. 



However this may be, it is certainly true that a full knowledge 

 ofche morphology and physiology of the variant bean seedling 

 doands a thoroughgoing investigation of the correlation between 

 tf structure of the first two leaf whorls and that of later whorls. 

 \^ have, therefore, been forced to consider the problem of the 

 rcrphological character of the leaf whorls produced at the third 



-* Harris. J. Arthur. A simple demonstration of the action of natural 

 Smoe II. 36: 713-715. 1912. 



t Hanis, J. Arthur. Studies on the correlation of morphological and physiologi- 

 cacharacters: the development of the primordial leaves in teratologiral bean seed- 

 lie. Genetics i: 185-196. 1916. 



* Harris, J. Arthur. Further studies on the interrelationship of morphological 

 *i physiological characters in seedlings of Pkmseolms. Mem. Brooklyn Boc Card. 

 I. In fress. 



109 



