460 



DATA OF PROPERTIES OF STARCHES OF PARENT- AND HYBRID-STOCKS. 



noted in C. moorei but not in C. zeylanicum, are ob- 

 served ; the lateral curvature at the proximal end is 

 frequently present, as in C. moorei but not in C. zey- 

 lanicum; a secondary set of lamella? at right angles to or 

 inclosing the primary set is not so frequently present as 

 in C. moorei, but more often than in C. zeylanicum; 

 the abrupt deflection at or near proximal end of elon- 

 gated grains present in C. moorei was not observed, this 

 also being absent in C. zeylanicum. The conspicuous 

 forms of the simple grains are ovoid (which sometimes 

 have the distal end squared), pyriform, elongated ovoid, 

 mussel-shell-shaped, and clam-shell-shaped. The addi- 

 tional forms are triangular with curved sides and rounded 

 angles, oyster-shell-shaped, irregular diamond-shaped, 

 elongated clam-shell-shaped, slipper-shaped, imperfect 

 quadrangular, and nearly round. The components of the 

 conspicuous compound grains are arranged more often 

 like those of C. moorei than of C. zeylanicum. The 

 compound grain composed of three components of me- 

 dium size is the same as in C. moorei, and the large 

 mussel-shell-shaped grain with a cresentric fissure divid- 

 ing the grain into one large and one fairly small com- 

 ponent is rare, as in C. moorei. The majority of the 

 grains are flattened, the number being larger than in 

 C. moorei, but not quite so large as in C. zeylanicum. In 

 form, the grains are much closer to C. zeylanicum than 

 to C. moorei. 



The hilum is a small, round, oval, or lenticularspot, 

 which is a little less refractive than in C. moorei, but 

 about the same as in C. zeylanicum. Multiple hila of 

 the same number and arrangement are not quite so fre- 

 quently observed as in C. moorei, but more frequently 

 than in C. zeylanicum. The hilum is very often fissured, 

 much more frequently than in C. moorei, but not quite so 

 often as in C. zeylanicum. The cavity and the fissures 

 are of similar character to those of both parents with 

 closer resemblance to C. zeylanicum, but the fissures are 

 not so deep as in the latter. The fissure passing from 

 the hilum is very much more frequently observed than in 

 C. moorei, but about the same as in C. zeylanicum. As 

 a rule, it is neither so long nor so deep as in the 

 latter. The range of eccentricity is from 0.45 to 0.10, 

 usually from 0.15 to 0.10 of the longitudinal axis. The 

 hilum in form, fissuration, number, and refractivity is 

 closely like that of one or the other parent or both 

 parents, but, on the whole, more closely approaches that 

 of C. zeylanicum than of C. moorei. 



The lamellce are demonstrable in a much smaller 

 proportion of grains than in C. moorei, but in a larger 

 proportion than in C. zeylanicum. When observed they 

 are fairly fine to very fine, and when near the hilum they 

 form rings similar to those noted for both parents, and, 

 as in the parents, the majority tend to follow the outline 

 of the grain. The lamella? near the hilum are finer, as in 

 both parents, but often they can not be made out for 

 one-third to two-thirds distalward from the hilum, as 

 is usual in C. zeylanicum. The presence of one very 

 coarse lamella, and the grouping of fine lamella? between 

 2 or sometimes 3 or 4 less fine, refractive lamella? is 

 found, as in both parents, but with a closer resemblance 

 to the character and arrangement observed in C. zeylani- 

 cum. Also occasional bands of less fine lamella? are 

 found, as in both parents, the band at the distal margin 



being more frequently present than in C. moorei, but 

 about the same as in C. zeylanicum. The very refractive, 

 wavy lamella limiting this band distally is not observed, 

 as was also the case in C. moorei. The presence of a 

 secondary set of lamella? is less frequent than in C. 

 moorei, but more frequent than in C. zeylanicum. The 

 number of lamella? in the primary set of large grains 

 varies from 48 to 64. The lamella? in character, arrange- 

 ment, and numbers are in certain respects like one or the 

 other parent or both parents, but on the whole, more 

 closely approach those of C. zeylanicum than of 0. moorei. 

 The grains vary in size from the smaller which are 

 4 by 3/*, to the larger which are 60 by 48/*, rarely 70 by 

 26/i., in length and breadth. The common size is about 

 48 by 32/t. In size and ratio of length to breadth the 

 grains more closely approach C. zeylanicum than to C. 

 moorei, but in length are closer to the latter. 



Polariscopic Properties. 



The figure is slightly to very eccentric, distinct, and 

 clean-cut. The lines of the majority are slightly broader 

 than in C. moorei, but about the same as in C. zeylani- 

 cum; and they cross each other obliquely, as in the 

 parents. They are less often bent and bisected than .in 

 C. moorei, and they are straight in almost as many grains 

 as in C. zeylanicum. Double figures are not quite so 

 numerous as in C. moorei, but about the same as in C. 

 zeylanicum. 



The degree of polarization is very high, very much 

 higher than in C. moorei, and a trifle higher than in C. 

 zeylanicum (value 95). Variations in the different 

 grains, as in the parents, is observed, but a larger pro- 

 portion of grains having a very high polarization is 

 present than in either parent. The variation in the same 

 aspect of a given grain is a little less than in C. moorei, 

 but about the same as in C. zeylanicum. 



With selenite the quadrants are well defined, unequal 

 in size, and often irregular in shape. They are less 

 irregular than in G. moorei, but a little more irregular 

 than in C. zeylanicum. The colors are generally pure, 

 but a much larger number of grains of a greenish tinge 

 is found than in C. moorei and also a somewhat larger 

 number than in C. zeylanicum. In figure, the degree of 

 polarization, and reaction with selenite the grains are 

 more like those of C. zeylanicum than of C. moorei. 



Iodine Reactions. 

 With 0.25 Lugol's solution the grains color a very 

 light blue-violet (value 35), lighter and less bluish than 

 in C. moorei, about the same as in C. zeylanicum, and 

 deepen somewhat rapidly to a moderately deep blue- 

 violet that is not quite so deep or so bluish as in C. moorei, 

 and of about the same depth and a majority of the grains 

 nearer the color of C. zeylanicum, but some are more 

 bluish than in this species. With 0.125 Lugol's solution 

 the grains color a very light violet, lighter and more red- 

 dish than in C. moorei, but a little deeper and of about 

 the same color as in C. zeylanicum. In the majority the 

 color deepens somewhat rapidly to a moderately deep 

 violet, and in others the color is fair. The coloration 

 is lighter but more reddish than in C. moorei. The 

 majority have about the same slight reddish tint, but a 

 little deeper color and a few are more bluish than in 

 C. zeylanicum (value 17). After heating in water until 

 the grains are gelatinized, and then adding 2 per cent 



