M I I.TONIA CVMBIDIUM . 



183 



t in relation to the par.-nt... (Table A 43 ml CharU 

 Mtie* of the hybrid are the Mine as those 



uf the - I p.irent in the n-a. ln-n- with iodine, ..il r.inin, 

 and puUMJum sulphocyanate ; the same as thoae uf the 

 pollen parent in niic ; the same as those of botli parents 

 in tliiiM- with sulphuric acid, hydrochloric acid, ami 

 pota*ium h\ droude. in all of which gelatinixation occurs 



.juickly ; intermediate, hut nearer thoaecd parvnt, in 

 that with t Moral hydrate; highest with polarization, 

 , lir. I. mine ;i. i.l. potassium io- 



dide, :' tiL-sium sulphide, sodium hydroxide, sodium sul- 

 phide, .-..hum salu-ylate, calcium nitrate, uranium 

 nitrate, -;r iitnini nitrate, colmlt nitrate, copper nitrate, 

 , iiprx chloride, copper chloride, barium chloride, and 

 irir chloride (in II lx'in>; doaer to the seed parent, 

 in '.' . lo,.-r to the pollen parent, and in 1 as cloae to one an 

 to the other parent ) ; and lowest with gentian violet and 



-rature, in both being closer to the seed parent in 



alter pr.i. tu-.illy the same. 



' -Mowing is a summary of the reaction-intensi- 

 ties: Same as seed parent, 3; same as pollen parent, 0; 

 same as both parents, 3; intermediate, 1; highest, 17; 



Two ven- conspicuous features of these data are the 

 very markedly dominating influence of the seed parent 

 <>n the properties of the starch of the hybrid, and the 

 equally iimrkiil tendency to reactivities of the hybrid, 



r than those of the parents. In 20 out of the 26 

 reaction* th<< seed parent is the game or closer to the 

 hybrul, while in only 2 is there closeness to the pollen 



t ; and in 17 reactions the hybrid exceeds the reac- 

 tivities of the parents. 



MFOSITE CUHVE8 OF REACTION-INTENSITIES. 



This section treats of the composite curves of the 

 reactiun-intcn.-ities, showing the differentiation of the 



ies of Mtltonia vexillana, M. rcnlii, and M. bleuana. 



rt K i:t.) 



The most conspicuous features of this chart arc: The 



cloae correspondence in the rises and falls of all three 



.:ig in the ' reactions with gentian violet, 



il hydrate, and calcium nitrate. In the gentian- 

 violet reactions the curves of M . rtrillaria and the hybrid 

 fall, while the curve of If. ratxlii rises; in the chloral- 

 hydrate reactions the curves of the fonner rise while the 

 curve of the latter falls; and in the calcium-nitrate reac- 

 tions tin- ( urve of M. nrz/ii appears aberrant by falling. 



rillnria has higher reactivities than the other pan-nt 

 in the react inns with polarization, iodine, choral hy- 

 drate, pyrogallic acid, potassium iodide, potassium sul- 



.inaU 1 , potaamum sulphide, sodium hydroxide, 

 calcium nitrate, strontium nitrate, copper nitrate, cupric 

 chloride, and mercuric chloride; lower reactivities with 

 -afranin, temperature, cobalt nitrate, and 

 barium chloride; and the same or practically the same 

 reaction-; with diromic acid, nitric acid, sul- 



phuric arid, hydrochloric arid, potassium hydroxide, 

 odium sulphide, sodium salicylate, and uranium nitrite. 

 In M. ifj-illaria the very high reactions with polarization, 

 nitric and, sulphuric acid, hydnn hlorir arid, potassium 

 hydroxide, potassium iodide, potassium sulphocyairit--. 



\ide, sodium salicylate. calcium n: 

 strontium nitrate, and copper nitrate; the high ron 

 with chloral hydrate, chromic acid, sodium sulphide, and 

 uranium nitrate; the moderate reactions with iodine, 



MI viol, t, safrnnin, pyroijallic acid, and |Hita>-ium 



sulphide: the low reactions with temperature, cobalt 



nitrate, cupric chloride, and mercuric chloride: and the 



ms with barium chloride. In M. ran/it 



thp very high reactions with nitric acid, sulphuric acid, 



hydrochloric acid, potassium hydroxide, potassium sul- 

 p'hiH vanaU', MNliuni Kaluylute, and .-ic-Mmm n.- 

 the high reaction* with polarization, safranm, chronm- 

 .i.id, sodium li\<lr..\,.|. . Kodium Hul|ilude, uranium 

 nitrate, and TO|I|MT nitrate; tle moderaU* n-jn tioii;- with 

 i. Mime, gentian uol.t, tem|HTature, potassium iwlide, 

 and calcium nitrate; the low reactions with <-lil,.r:il 

 hydrate, pyrogallic acid, potassium sulphide, cobalt ni- 

 trate, cupric chloride, and mercuric chloride; and the 

 very low reactions with barium chloride. In If. bleuana 

 the very high reactions with polarization, diromic acid, 

 nitric acid, sulphuric acid, hydrochloric acid, potassium 

 hydroxide, potassium iodide, potassium sulphocyanate, 

 potassium sulphide, sodium hydroxide, sodium sulphide, 

 sodium salicylate, calcium nitrate, uranium nitrate, 

 strontium nitrate, and copper nitrate : tlu> high reac- 

 tions with chloral hydrate, pyrogallic acid, cupric chlo- 

 ride, and mercuric chloride; the moderate reactions with 

 iodine, gentian violet, safranin, and cobalt nitrate; the 

 low reaction with temperature; and the very low reac- 

 tion with barium chloride. 



Following is a summary of the reaction-intensities: 



44. COMPARISON OF THE STARCHES OF CYUIIIDII M 



I.OWIAMM, C. Kill K.NEVM, AND C. EBUKNKO- 



LOWI4JTDX. 



In the histologic characteristics, polariscopic figures, 

 reactions with selenite, qualitative reactions with iodine, 

 and qualitative reactions with the various chemical rea- 

 gents all three starches exhibit properties in common in 

 varying degrees of development together with certain 

 individualities which collectively are in each case char- 

 acteristic. The starch of Cymbidium /out'naum in com- 

 parison with that of C. tbwrnmm has somewhat leas 

 numerous grains of the disaggregate type ; pressure facets 

 on separated grains are more numerous; the surfaces of 

 disaggregates are more regular; large grains of the iso 

 lated disaggregate type are more numerous and more 

 varied in form; compactly arranged triplets and quad- 

 ruplets are more common; components of doublets are 

 iiion- often of equal size; and mosaics of live to ten com- 

 ponents are more rounded. The hilum has a cavity 

 or cleft more often ; it is more often fissured ; there are 

 various modifications of Assuring; eccentricity is less. 

 The lamella? are much less often demonstrable*; th- 

 an absence of a secondary set of lamella? at riu'ht angle 

 to the primary set; the number is probably less. The 

 size is on the whole smaller, and differences are noted 

 in the proportion of length to width. In the polario 

 - I'-nitc, and qualitative iodine reactions various differ- 

 ences are recorded in the three starches, mostly appa- 

 rently of a very minor character. In the qualit 

 reactions with chloral hydrate, chromic acid, nitric arid, 

 potassium hydroxide, potassium iodide, potassium sul- 

 phocyanate, and sodium salicylate various points of dif- 

 ference have been demonstrated, but these seem to be of 

 minor character. Throughout, with few exceptions, the 

 hybrid is much closer to C. lovianum. 



Krucliun-intmtiliet fffritttd ky Light. Color, and Temper* 

 frf Ktacliont 



Polarisation: 



C. lowiamun. hih. ralue 80. 



C. eburnnim. Kigh. (mm than in C. lowitniim. raluc 76. 

 C. bttfn.-low.. hick, to* BUM M in C. lovianum. vmlvtc 80. 



