2 70 NEW JERSEY STATE AGRICULTURAL 



60. "Tall Butter Sugar/' 74. "Rivenhall Wonder." 



61. "Blue Ribbon Chieftan." 75. "Scotch Champion." 



62. "Canada Blue." 76. "Sherwood." 



63. "Canada White." TJ. "Velocity." 



64. "Early Morn." 78. "Bountiful." 



65. "Early Prize." 79. "Edwin Becket." 



66. "Edward VII." 80. "Maud S." 



67. "Gardener's Favorite." 81. "Morning Star." 



68. "Large Marrowfat." 82. "Canadian Beauty." 



69. "Lightning." 83. "Early Britain." 



70. "Mammoth Luscious Sugar." 84. "Golden Vine." * 



71. "May Queen." 85. "Grass." 



72. "Pilot." 86. "Prussian Blue.' 

 "j^t- "Rawson's Clipper." 87. "Chick Pea." 



In Plate XXV is shown a set of pea seeds with varietal num- 

 "bers that are involved in the work reported upon in the following 

 pages. Plate XXVI shows a similar set with the pod of each 

 variety bearing its record number and five dry peas to its right, 

 respectively. 



NOTES UPON THE INITIAL GROWTH OF PEAS. 



The average pea seed imbibes from 65 per cent, to 165 per 

 cent, of its own weight of water in twenty-four hours, wrinkled 

 peas imbibing faster and more than smooth peas. After one day 

 the seed coat loosens and the radicle is elevated somewhat from 

 the cotyledon. 



In two days, the radicle is from one-half to one inch long and 

 Hihe plumule shows signs of elongation. The best position for the 

 seed is when the radicle points directly downward and the plu- 

 mule arches upward. 



At the end of the third day the plumule is from one-eighth 

 to three-quarters of an inch long. At the end of the fourth day 

 the side roots start from the tap root and the latter has many 

 root hairs. The elongation of the root shown by ink marks is 

 most rapid at two inches back of the tip and with the young stem 

 in the region of the first leaf. The first and second leaves are 

 nearly alike in being only the stipules with a minute slender mid- 

 rib, from the axils of which branches may start in later growth. 

 The third leaf shows some indication of leaflets. The fourth leaf 

 is quite normal with few leaflets and small tendrils. 



At the end of one week the root system consists of the tap root, 

 two to six inches long, and many side roots arranged in three 

 rows. The root hairs cover zones upon the roots and expose 

 much surface for absorption. The stem is three inches high and 

 is quite green at the top where the oldest leaf holds up its ten- 

 drils as the highest parts while the tip of the stem is folded 



