INDEX 



153 



Shoot apex, term replacing grow- 

 ing point, 21 

 tunica-corpus zones of, 22-24 

 variation in form of, 21-22 

 Sieve-cell, of gynniospernious 



l)hIoeni, 1)3 

 Sieve-field, origin and use of term, 



m 



Sieve-plate, mori^hology of, 9C-07 

 origin and structure of, 96-!)7 

 position of, 06 

 Sieve-tube, solute-movement in, 

 94, 95 

 use of term, 93 

 elements, contents of, 9.'i-96 

 definitive cells of phloem, 93 

 disintegration of nuclei of, 95 

 in Ciicurhita, 98-99 

 lateral wails of, 97-98 

 material for study of, 98-99 

 obliteration of, 97 

 protoplasts of, 95-90 

 Simple perforation, 83, 89-90 

 liit-pairs, in xylem parenchyma 

 of Tccoma, 12 

 study of, 12 

 Siphonostele, ami)hiphloic type 

 of, 104 

 ectojihloic type of, 104 

 general structure of, 103 

 problems of evolution of, 103 

 Sliding gi'owth, of fibers, 7(i 

 Sliine-droi)s, in sieve-tube ele- 

 ments, 96 

 Slime-plugs, nature of, 95-90 

 Sviilux, study of root of, 136 

 SoJiiinii)!, collenchyma of, 03 

 storage parenchyma of, 5!) 

 Special reagents, 141-142 

 Sphaerraphides (see Druses), 5 

 Spiral elements, of protoxylem, 84 

 Spongy parenchyma, functions of, 

 125-126 

 in leaf ot Sifringa, 125 



Spring tracheids, of Pinus, 88-8i) 



wood, of annual ring, 115 

 Squash (.see also Cucnrhita), study 



of stem hairs of, 2-3 

 Starch, in chlorophists of Pcl- 

 1i(>)iia, 4 

 in storage tissues, 4, 109, 111, 



117, 134 

 sheath, relation to stele, 104 

 Stelar theory, application of, 103 

 Stele, boundary of, 104 



morpliology of in roots, 132 

 ontogeny of in roots, 131-132 

 ontogeny of in stems, 104-106 

 principal types of, 103 

 structure and development of, 



103-106, 131-132 

 structure of in roots, 131-132 

 structure of in stems, 103-104 

 types of in roots, 132 

 Stem, anatomy of in Cnciirhifa, 08 

 cortex of, 102-103 

 epidermis of, 102 

 material for study of. 108-120 

 morphology of, 101 

 nodal anatomy of, 101-102 

 ])rinuiry structui'e of, 102-104 

 secondary structure of, 106-108 

 stele of, 103-106 

 structure of in gvnuiosperms, 



117-118 

 study of in A n'sfolnrJn'ti, 119- 



120 

 study of in corn, 118 

 study of in monocotyledons, 118 

 study of in PcJurgoniinn, 108- 



111 

 study of ill pine, 117-118 

 study of in Tilia. 111-117 

 study of viiu^-type of, 118-120 

 Stoma, action of guard cells of, 

 47-48 

 functions of, 47 

 ontogeny of, 48 

 use of term, 47 



