THE ORCHID WORLD. 



ODONTOGLOSSUM WALTRAUTE. 



(n.^:viuim X Harryanum;. 



This plant, the only one I saved, bloomed 

 September 27th, igio, and proved to be a 

 remarkably pretty thing. Imagine a \ery 

 strong and heavy spike of nae\'ium much 

 exaggerated, flowers thicker and larger, of a 

 bright hght-yellow, copiously spotted with 

 rich-brown, having a hp midway between the 

 parents, and you have a mind picture of a 

 hybrid well worth re-raising. 



de B. Crawshay, 'November 20th, igii. 



4^ ^ ^ 



ODONTOGLOSSUM KASHIMA. 



Lindleyanum Harryanum 



L___J 



Hallii Wattianum 



Kasliima. 



This is a very strong grower as would be 

 supposed, but a very shy bloomer as all 

 Wattianum hybrids seem to be. They carry 

 very fine spikes of large flowers. Sepals and 

 petals light-yellow marked with brown, in 

 form intermediate. The lip very large, 



THE ATMOSPHERE OF 



THE mamtenance of a suitable tempera- 

 ture IS one of the essential principles 

 of Orchid culture. The mere act of 

 registering, by means of a thermometer, the 

 amount of heat does not explain how or from 

 whence it is produced. Not only is the topic 

 of special interest at this season of the year, 

 but a good knowledge of the subject is of 

 great importance to all engaged in the prac- 

 tical work of Orchid growing under glass. 



Without discussing the theoretical ques- 

 tion of " What IS heat ?" it will be sufficient 

 for our purpose to state that heat manifests 

 itself in three ways, viz., by conduction, 

 radiation, and convection. A clear com- 

 prehension of these principles will greatly 

 assist us in understanding how the tempera- 

 ture of the atmosphere of an Orchid house 

 may be artificially maintained. 



65 



oblong, ol same cokmr, with a large ol;long 

 blotch that develops a shade of purple around 

 the edge of the brown. I bkK)med it in 

 September, 1 9 1 1 . 



de B. Crawshay, Nui'ciiibcr 201/1, nji i. 



U ■i^ 



ODONTOGLOSSUM GALEA. 



nobile crispum 



I ! 



sceptrum ardentissimum 



Galba 



This meagre result I bloomed October 

 22nd, igio, and I have been waiting (and am 

 likely to by past evidence) for a good variety 

 to publish it upon. A dirtier muddy mauvish- 

 brown it would be difficult to make, and most 

 of them have not the mauve, which the pollen 

 parent could not transmit. 



The whole flower is almost a solid ground 

 colour as in sceptrum, and save that it is an 

 experiment, which no one else need try, it is 

 hardly worth recording. Fortunately, they 

 are good growers, ;ind make a fine spike of 

 decorative assthetic-coloured llowers. 



de B. Crawshay, Noveinber 20II1, il/i i. 



AN ORCHID HOUSE. 



Conduction. If two short rods of similar 

 length, one composed of .silver and the other 

 of iron, have one of their ends placed in a fire 

 the other end of each will gradually become 

 warm, but not at the same rate, the rod of 

 silver becoming hot in a much less space of 

 time. This is because silver is a much better 

 conductor of heat than iron, and it may be 

 stated that that which takes up heat readily 

 is just as ready to give it up. 



It is at once evident that as the fire heab 

 cannot be directly applied to the water an 

 intervening material of high conductive power 

 must be used. Also, if the hot-water pipes 

 are constructed of material having a very low 

 conductive power it would be almost impos- 

 sible for the heat of the water to ha\'e any 

 effect on the atmosphere of the house. The 

 metal having the highest conductive power is 



