INDEX 



155 



VACUOLES, and wall-thicken- 

 ings of tracheae, 85 

 in cells of shoot apex, 20 

 Vacuome (see also orgastic sub- 

 stances) 

 in cambial initials, 20, 27-28 

 in hair cells, 2 

 in meristems, 20, 27-28 

 Vasa mixta, use of term, 85 

 Vascular bundle (see also leaf 

 traces), 86, 87, 08, 110-111, 

 118-120 

 of AristoJovhia, 110-120 

 of corn, 118 

 of Cncurbita, 98 

 of Pelargnw'iini , 110-111 

 of Trij'oliiiDi, 8(J, 87 

 Vascular cambium, concept of, 

 106 

 fusiform initials of, 27, KXi 

 initials of, 27-28, 106 

 study of living cells in Pi)iiist, 28 

 study of living cells in h'i>hiiii(i, 



28 

 vacuolated cells of, 27-28 

 vascular-ray initials of, 27, 106 

 use of term, 27 

 Vascular system, functions of, 80 

 general structure and develop- 

 ment, 80 

 in bud-scales, 128 

 in leaf of P/»»,s, 128 

 in leaf of Si/riiigii, 126-127 

 in leaf of Zea, 127-128 

 Vascular tissues, primary and sec- 

 ondary, 86-87 

 Vcrbascum, dendroid hairs of, 53 

 Vessel, use of term, 81 

 Vessel eli'iiieiit, evolution and dis- 

 tribution of, 82-83 

 formation of perforations in, 



83-84 

 general characters of, 80-81 

 of Betula, 80 

 of Cucnrhita, 90 

 of Liriodendron, 89 



Vessel elements, of oak, 89-90 



of Pteridimn, 88 



ontogeny of, 83-84 



pitting of, 82, 88, 89-90 



structure of end walls of, 84 



study of, 89-90 

 Vessels, distribution in vascular 

 plants, 82-83 



in ferns, 82, 88 

 Vestigial pit-pairs, in fibers, 14- 

 15, 75, 77-78 



in wood fibers of Plat anus, 15 



morphology of, 14 



morphology of in bast fibers, 77 



study of, 14-15 

 Vitis, septate fibers of, 78 



WATP]R, in walls of collenchyma 

 cells, 63 



vesicles, structure of in Mesem- 

 brij(nithenni)n, 53, 54 

 Wood fibers, of oak, 78 



of PJatanits, 15 



of Vitis, 78 

 AVood parenchyma, of Tilia, 116 



simple pit-pairs in, 12 

 Wood pulji, production of, 90 



XYLEM, definitive cells of, 80 



plates, use of term, 131 

 Xylem-ray parenchynm, simple 



pit- pairs in, 12 

 Xylem rays, of Tilia, 116 



origin of, 27 



ZA3IIA, shoot apex, 20 

 Zra, guard cells of leaf, 49 

 study of leaf of, 127-128 

 Zonal structure, of angiospei'mous 

 shoot apices, 22-25 

 of gymnospermous shoot apices, 

 20, 25 

 Zonation, of angiospermous shoot 

 apices, 22-25 

 of gymnospermous shoot apices, 



20, 



OP, 



