Subject Index 465 



species of: (inlilxwiczii, 311, 325: nnti- 

 {loi'iczii X cliococtise, 311, 325: 

 rluicoeuse. 311, 325; deinissuin. 

 311: ryliiiiii. 311: luberosuin, 311 



transfer of disease resistance, 325 

 Somatic doubling, 294 

 Somatic meiosis, 45-46 

 Somatic reduction, 94 



equal or unctiual separations, 42 



pseiuioanaphase, 15 



relation to meiosis, 45, 94 



terminology, 45-46 

 Somatotropic hormone, 230 

 Sorbitol, 417 

 D-Sorl)itol,416 

 Sorglniin 



autotetraploiil sudan grass, 323 



segregations, 323 



species of: halojiciise, 323: xnilgare var. 

 sudanense, 323 

 Spartina toivnsendii, 279 

 Species Plantarum , 7 

 Spelt wheat synthesized, 295-97 



invested type, 296 

 Speltoid wlieat, 357 

 Spermatids, 204-5 

 Spermatocytes, 204 



heads of, 382 

 Spermatogenesis, 201 

 Spermatogonia, 204 

 Spermatozoa, 206, 382 

 Sphaerechiniis, egg, 202 

 Spina bifida in chicks, 209 

 Spinacia, 42, 80 



recovery, 95 



root tips, 95 

 Spindle, 65-98, 392, 102, 421: see aha 

 Deformed spindle, Pseudospindle 



acenaphthene. 82 



antagonists, 396, 416, 418 



in Arbacia. 71-77 



arrestetl metaphase, 36, 81 



artefacts, 67 



as\nmietrical, 94 



l)ipolar, 93, 94, 96 



birefringence pattern, 75-76 



cell plates, 89-90 



centromeric, 82 



centrosomic, 81, 84 



chemical action on, 403-4, 416 



chromosomal fibers of, 77 



clea\age processes, 53, 87-89 



colchicine and, 392-93 



continuous fibers of, 87-89 



contraction of, 420 



cytoplasm and, 65-98 



"cvtoplasmatizalion" of, 7 1 



damage. 31 



deformed, 79 



destruction of, 69, 70, 71 



disa])pearance of, 76 



disengaged from fiber, 36 



disturbances classified, 86 

 ajiolar. 86 

 Ijipolai', 8() 

 nudlipolar, 86 

 unipolar, 86 



fibers, 65-67 



form of, 78-79 



fundameiUal pioljjcni of mcdianism, 

 395 



inacti\ation of, 28 



inhibiting actions decreased. 374 



inhibition of, 36, 68-69, 399 



li]:)oid sohd)ility and. 402 



mechanisms of. 81-86 



merostathmokinesis. 8(i 



metaphase, of Cliaelopterus, 75 



microdissection of, 33 



mo\emcnt of, 42 



narcotics, 401 



ncurol)lastic cells. 66 



plnagmoplasts, 89-90 



physical action, 399-401 



physiology of, 394 



pluripolar, 204 



poisons of, 391-92, 411-16 



jjscudo, 79 



rate of disappearance, 76 



recovery of, 56 



retardation studies, 77 



reversibility characteristics of, 91-94 



"solubiliti/ation" of, 81 . 



specificity of, 67, 393 



stathmokinesis, 86 



submicroscopic structures, 75 



successive changes of, 70 



svnergists. 396, 416, 418 



toxicity, 374 



tropokinesis, 86 



Tubifex, 53 



X-ray, 374 

 Spiral coiling of chromosomes 



chromatin development. 32 



excessi\e coilin". 16 



major, 32 



minor, 32 



relational coiling, 46-49 

 Spirosiyra, 119, 125 

 Spleen, 17(), 181, 248 

 Sporogenous tissues, 119 

 Sporophytic cells, 120 

 Spring fruiting, 5 

 Stiuamoirs cells, 376 

 Staminal hairs, Trcidescantia, 385 



process of interjjhasc, 51 



technique with, 33, 7,3-75 



in vitro study, 73 

 Star formation: see also C-metaphase 



(igures by I'ernice, 18, 39 



nudtiple. S3 



mull iplc. hi . lllium . 1 1 



