ODONTOGLOSSUM 



These, -with the floors, should be hosed down two or 

 three tunes daily, to keep the house as cool and as 

 moist as possible. 



Ventilation is highly essential at all times, especially 

 in dull or wet weather. When the atmosphere is over- 

 charged with moisture, the cnumtity must be governed 

 by outside conditions. T..|i i^ m;! iii .11 is most satis- 

 factory, because it allow - ■' I I ■ , r 1(1 escape, gives 

 less direct draft on the 1 , I - s not have the 



drying effect produced li. -im ,,u:-. 



The temperature dunn^ v, luui ;.li..ulil iicvi-r ri"p 

 above 65° F., even with mild sun heat, uiiil in;i\ 1 ill i.. ts 

 or .50° at night, or even lower, without inim ;. ; .in mm 

 summer it must be kept as low as theoiii-hl' iiiii|mi;i 

 tare will admit. Fire heat should be dispin^i il wiili :i^ 

 early as possible iu spring. 



Odontoglossums do well under pot culture, excepting 

 a few, such as O. Londesborougliianiim and O. coro- 

 narium. with Imii; iTii-iiint,' rliizmius; O. ril rnsmum, 



Whirli li:i^' |.i'.,.l..l..M, IV.... r -.•iM'-. :iiMl ^-..nii. .if ^tho 

 Whirli 'ii ■ :■ ■ ■■ ■" ' ' 



ODONTOGLOSSUM 



1113 



No- 



fibrous peat, live sphagnum and cluun duoayed leaves 

 in equal quantity, well mixed together, afford 11 very 

 satisfactory compost. About one-half of the pot space 

 should be devoted to drainage of charcoal or broken 

 potsherds. The plants should be firmly potted, leaving 

 the surface slightly convex, thus elevating the base of 

 the plant a little above the rim of the pot when finished. 

 The O. crispum section, which includes O. Coradiiiei, 

 O. t/loriosum, O. cirrhosum, O. liileo-purpureiim, O. 

 Peacatorei, and kindred species, require an abundance 

 of water at all seasons ; in fact, the compost should 

 never dry out, and judicious light overhead syringing 

 once a day is beneficial in bright weather, but on very 

 warm days it shotild be applied in the evening, at the 

 same time allowing free ventilation to ensure good 

 atmospheric action. Weak liquid cow manure during 

 the flowering period is also of assistance. 



Species of the O. grande section do not require as 

 much water at the roots as the O. crispum type ; the 

 compost should be allowed to dry out frequently. They 

 are also benefited by a little sun during winter. 



O. citrostmim is an exception to the genus as regards 

 temperature, and should be grown 10° warmer. It does 

 very well in the Cattleya department, enjoys a good 

 supply of water at the roots at all seasons, and may be 

 easily induced to flower freely by giving it a sunny loca- 

 tion during winter. 



Very few of the species can be satisfactorily propa- 

 gated by division ; the trade depends principally on 

 fresh importation. 



Among the worst enemies of Odontoglossums are 

 slugs and the small shell snails. They destroy the ten- 

 <ler flower-scapes, often attacking them even in the leaf 

 sheath. A piece of cotton wrapped about the base of 

 the pseudobulb will afford a means of protection, and 

 many may be caught by distributing bits of apple, 

 potato, or saucers containing dry bran freely among the 

 plants. Look them over morning and evening %vith a 

 lantern. 



For other cultural notes on Odontoglossums. see 

 Orch. Eev. 4:22. Robekt M. Gket. 



(',,,•1 n,J,i,iln,!l,i.-isi,,„j-.-T]u- iiKin.'urcini'iit uf the tropi- 

 c.-.l lii^-l.iv-uiii^ liiiniil ill liiL'h iiliiluil.s 1^ .mo of 



The collection of II. 11. II -r.r -li : w. I. i->.Mass.; 

 has long been noted, .li ... . .1 in the 



last twelve years. Tli. • : i i^ked to 



give an account of till- iiM I .|. ,, I /. .u li I 1.. Harris 



long maintained this tiTU' .•.ill.-.-n.in wuli |i. i-liaps less 

 decrease than in any other coUectiuu iu Ihetouutry. 



The great problem, of course, with these plants is to 

 keep them cool enough in summer. The difliculty will 

 probably never be wholly solved until the advent of 

 urtiflciai refrigeration. Shading alone is in.suflii-ient. 

 Tlic best principle to take advantage of is the coolness 

 jiroduced liy the rapid and excessive evaporation of 



cool. 



How to produce a great and constant evaporation is, 

 then, the particular problem, and Mr. Harris' device 

 was an exceedingly ingenious one. Back of his Odon- 

 toglossum house he had a brick wall covered with Eng- 

 lish ivy, and he had water dripping over the whole vine 

 during hot weather. This gave him an extraordinarily 

 large evaporating surface. 



\v;(i.T |iiiM i\ . . , I, l.iiiM u ~ 111. ill 1 > ■iiiing surface. 



A -r;i\ .II.'! ■ ' ■ ' ' i' ' . ■.•: ,ii nig surface. 



which w:i ,i. .■.;.. i .ii.-iii- \s iiili r. .\ ii ^il 1 r li 1 1 il was 



made til II' ■ ' i ^^.l\\ mu^ imlin^. 'I'ii.' wiiter 



tank was liniinliil .i\.r Ln' llir palms, Init tli.' water 

 below did not tuniisli enough atmospheric moisture for 

 the palms, and they had to be removed. The trouble 

 was that the water in the big tank, being colder than the 

 air, actually acted as a condenser. The next winter the 

 tank was again boarded over, but the water in the tank 

 was drawn off and the floor covered with a C-inch layer 

 of gravel. The results were entirely satisfactory. 



J. F. COWKLL. 

 With Odontoglossums we have had good results the 

 past season by using what we call the Cookson formula, 

 recommended by Mr. Norman C. Cookson in the"Orchid 

 Review" for May, 1899. The formula is as follows: 

 Three ounces of potassium nitrate and 2 ounces of am- 



growth, or when flowering, 1 ounce of the solution is 

 added to each gallon of water used. In the experience 

 of the writer, the above mixlurr is ili.. best food met 

 with for cool orchids. In liin.- ii will ]ir.il)ably bring 

 the plants into such a vi.gor.m, stat.- that they will be 

 able to stand our hot summers witlmut so iiuu.-h suffering. 

 A. J. Newell. 



INDEX. 



album, 27, 40. facetum, 9. nfflvium. 30. 



Alexandra, 34. Gouvilleanum, 34. nebulosum, 36. 



Andersonianum, 34. gloriosum, 13. Nevadense, 21. 



Anderson!, 39. grande, 3. uobile, 33. 



apiatum, 34. graiidiflorum, 6. odoratum, 14. 



Ashworthianum,34. guttatum, 34, 36. Oerstedii, 38. 



aspersum, 10, 24. Hallii, 16. pardinum, 1. 



bellulum, 18. Harryanum, 19, 20. Pescatorei, 33. 



Bictoniense, 27. hastilabium, 28. pulchellum, 41. 



Bluntii, 34. Hebraicum, 10. punctatum, 40. 



brevifolium, 2, hystrix, 8. radiatum, 8. 



candidulum, 36. Insleayi, 4. 5. ramosissimunl, 29. 



eastaneum. 15. Krameri, 37. Reichenheimii, 17. 



Cervantesii. 39. lasve, 17, rosellum, 40. 



cirrhosum, 31. latemaculatum, 14. roseum, 40. 



citrosmum, 40. Lehmamui. 34. Rossii. 43. 



constrietum, 15. leopardinmn, a. rnli('s.-(..|is, .13. 



Coradinei, 6. LindleyaTi-ai 7 l?ii'-l:.M-i:tiimM :!?. 



cordatum, 26. Londesl..,i . .u.-l i.m. s .....m -jj. 



•ispa 



urn. 8. 

 34. 



cristatum, 25. maculatiuu, ii, :;l 



Dawsonianum, 44. Madx-euse. 35. 



Duyanum, 25. majus, ,39, 41, 43. I 



derorum. 39. Marige, 34. 



Ertwardi, 45. maxillare, 36, 3(i. 1 1 



EKertoni, 42. membranacenm, ,iii. V 



Ehrenberffhii,43,i4. mirandum, 12. M 



Synopsis of Sections. 

 A. Fls. yellow, variously spnttedwith brown, c 

 Section 1. Ground color of the labellum yellow. 



Species 1-14 



Section II. Ground color of the labellum white, 



rarely pale yellow or changing to yellow. Species 15-28 

 AA. F!s. white, sometimes shaded with rose or cream, 

 never u-ifh a britjht yellow or greenish yellow 

 ground color. 

 Section III. Plants not dwarf: fls. numerous, in 



