20f> AlMnisw in Maize 



the characteristic green striping. This approximates very closely the 

 3 : 1 ratio and indicates that a simple Mendelian recessive is being 

 dealt with. 



Crosses between plants of the different categories were made as 

 follows : 



Ze(( jciponica x golden. 



Green-striped x golden. 



Green-striped x yellowish-white, later turning green. 



In tliese cases neither parent in any of the crosses was fully green, 

 yet all the F-^ plants resulting from each cross were of normal green 

 colour. The F., generations were grown from the respective crosses, 

 and notes were taken concerning the seedlings until five weeks after 

 date of planting. Since the japonica-striped plants, the green-striped 

 ones, and the golden ones cannot be identified with extreme accuracy 

 until they are from eight to ten weeks old, it was unfortunate that no 

 notes could be taken at a later date. But the absence of the writer 

 from the State during the remainder of the growing season prevented 

 such notes being taken. 



At the date when the last notes were made, however, one could 

 distinguish individuals of the various categories. In the F.. of the 

 cross between plants of Zea japonica and those of the golden type 

 there were 102 green plants, five of the japonica type, 37 golden ones, 

 and four golden plants striped after the manner of Zea japonica. The 

 second generation of the cross between green-striped plants and golden 

 ones consisted of 63 green plants, 14 green-striped ones, 22 of the 

 golden type, and four golden plants which had the peculiar striped 

 pattern of the green-striped category. In F„ of the cross between 

 green-striped and yellowish-white plants there were 146 green plants, 

 25 green-striped, and 42 yellowish-white. In these cases there were 

 too few individuals in the various F., families for one to place much 

 dependence in the ratios, yet it seems probable that they arc merely 

 modifications of the dihybrid ratio. A further study of these crosses 

 must be made, in order to fully understand the relation between the 

 various types. 



An Anatomical Study of the Leaves of Certain Types of Maize. 



At the suggestion of Professor Emerson the writer undertook a 

 histological study of the leaves of some of the various types of albescent 

 maize. It was soon found that a more satisfactory study could be made 



