CYMBIDIUM. 



763 



somewhat less than in C. loivianum. Well-marked pres- 

 sure facets are present and are more numerous on the 

 separated grains than in C. lowianum. The surface of 

 the grains of the isolated disaggregate type is usually 

 regular, more often than in C. lowianum, but the same 

 irregularities were observed with the exception of the 

 broad rounded swelling at one side which probably con- 

 sists of a secondary set of lamellae. The conspicuous 

 forms among the grains of the isolated disaggregate types 

 are nearly round, round, ovoid, ellipsoidal, and pyriform. 

 The conspicuous forms of the separated grains are low 

 and high dome-shaped, usually with either a squared or 

 pointed distal end, bell- jar-shaped, polygonal and ovoid 

 with concave distal end. In addition a few much larger 

 grains of the isolated disaggregate type are scattered 

 among those already noted, and they are more numerous 

 and more varied in form than in C. lowianum; they have 

 various shapes such as broad and low triangular ellip- 

 soidal, nearly round and high triangular. The conspic- 

 uous forms of the aggregates are the same as in C. 

 lowianum, but the compactly arranged triplets and quad- 

 ruplets are more common ; the components of doublets are 

 more often of equal size, and the mosaics of from 5 to 10 

 components are more rounded in form, than in C. low- 

 ianum. The grains are not usually flattened. 



The hilum is usually demonstrable and may appear 

 as a small, round or lenticular, non-refractive or slightly 

 refractive spot, as in C. loivianum; but generally either a 

 cavity or a cleft is found at the hilum, and much more 

 frequently than in C. lowianum. The cavity varies from 

 small to moderately large and rounded. The hilum 

 varies from centric to moderately eccentric. The range 

 of eccentricity is usually from 0.42 to 0.25, more often 

 from 0.42 to 0.33, of the longitudinal axis, less than in 

 C. lowianum. The fissures at the hilum are generally 

 arranged as follows: 1 short, transverse or diagonal; a 

 group forming a stellate figure, or one transverse that 

 is intersected by a diagonal longitudinal to form a cruci- 

 ate figure. The longitudinal fissures sometimes intersect 

 the hilum ; also sometimes one of a pair of oblique As- 

 sures; and also the middle one of a group that extends 

 both distalward and proximalward ; but more frequently 

 the fissures emerge from the hilum and are directed 

 distalward. In dome-shaped grains there are 2 to 3 

 fissures proceeding from the hilum to the corners of the 

 pressure facets at the distal margin, depending upon 

 whether a squared or pointed distal end is present, etc. 



The lamella; are not usually demonstrable, much less 

 often than in C. lowianum. When apparent they are 

 found to be of the same character and arrangement as in 

 C. loivianum with the exception that no evidence was 

 noted of a secondary set placed at right angle to the pri- 

 mary set. Sinco the number can not he determined 

 throughout the whole grain, the entire number is prob- 

 lematical, but on the larger isolated grains in which most 

 of them are demonstrable, 8 to 10 may be counted, 

 probably less than in C. lowianum. 



The size of the grains varies usually from the small 

 isolated disaggregate type, 3 by 2ti, to the larger grains 

 of this type which are 17 by 12/*, in length and breadth. 

 The common size is about 12 by 10/* in length and 

 breadth. The isolated grains of the aggregate type vary 

 from the smaller which are 4 by 3/x, to the larger which 



are 17 by 12/*, commonly 8 by 811, in length and breadth. 

 The grains are, on the whole, smaller than in C. 

 lowianum. 



Polakiscopic Properties. 



The figure varies from centric to rarely quite eccen- 

 tric, and is slightly eccentric in the majority of the 

 grains. It is not so eccentric as in C. lowianum. The 

 characters and the arrangements of the lines are about the 

 same as in ('. lowianum. Double and multiple figures 

 are observed in about the same proportion as in C. 

 lowianum. 



The degree of polarization is high (value 75), but 

 there is a greater variation among the different grains, 

 some being moderately high, thus making the mean some- 

 what lower than in C. low in num. 



With selenite the quadrants are sharply defined as in 

 ('. lowianum. They are usually less unequal in size than 

 in C. loivianum, but of about the same degree of regu- 

 larity. The colors are pure in most of the grains, but the 

 yellow is less often pure than in C. low inn um. 



Iodine Reactions. 

 With 0.25 per cent Lugol's solution the grains color 

 a moderate reddish-violet (value 45), slightly lighter and 

 considerably more reddish than in C. lowianum. They 

 deepen about as rapidly, but do not reach quite so great 

 a depth, and they remain more reddish than in C. low- 

 ianum. With 0.125 per cent Lugol's solution, the grains 

 color a light reddish-violet which deepens somewhat 

 rapidly to a moderate reddish-violet, the color both im- 

 mediately and later being slightly lighter and consider- 

 ably redder than in C. lowianum. After heating in 

 water until all the grains are gelatinized and then adding 

 a 2 per cent Lugol's solution, most of the grains become 

 a deep dull blue, and a few of a moderate blue, but all 

 with reddish tint; the mean coloration is deeper with 

 less of a reddish tint than in C. loivianum. The solution 

 is a deep purplish-blue, deeper and more reddish than in 

 C. lowianum. If the preparation is boiled for 2 min- 

 utes and then treated with an excess of 2 per cent Lugol's 

 solution, most of the grain-residues color a moderate blue, 

 a few a deep blue, all with reddish tint; most of the 

 capsules color a deep reddish-heliotrope, a few being 

 wine-red. The grain-residues are lighter and far more 

 numerous, the capsules are colored deeper but are much 

 less reddish in tint, and the solution is slightly lighter 

 in color than in C. loivianum. 



Aniline Reactions. 



With gentian violet the grains immediately color 

 lightly to moderate, a larger number of the latter than in 

 ("■'. lowianum, so that the mean reaction is somewhat 

 deeper. In 30 minutes they vary from light to moder- 

 ately deep, the majority being moderate (value 57). 

 There is greater variation among the grains, but more 

 of the moderately deep, and hence the mean reaction is 

 slightly deeper than in C. lowianum. 



With sa'franin the grains immediately color light to 

 moderate, with a larger number of the former color; the 

 mean is slightly deeper than in C. lowianum. In 30 

 minutes the majority are colored moderately, a minority 

 moderately deeply colored (value 55), a larger number 

 of the latter than in C. loivianum, and hence the mean 

 coloration is slightly deeper. 



