OSTEOPOROSIS. 



263 



sufferers had been previously kept on this kind of fodder. I 

 saw this fact well exemplified in Hongkong, where the Happy- 

 Valley forms the only pasture-land. As this is a more or less 

 flat piece of ground, about IJ mile round, nearly on the level of 

 the sea, and as it receives almost all the water which drains off 

 the sides of the neighbouring hills; the grass on it, in that 

 tropical climate, is, naturally, very coarse and rank. One gentle- 



Fig. lOO. — Horse's head suffering from osteoporosis. 



man whom I knew there, had five ponies that died from this 

 disease, all of which had shown symptoms of it only after having 

 been turned out to graze in the Happy Valley. He had no case 

 of it among those ponies of his which had not been turned out. 

 While in the colony, I met other horse owners whose experience 

 was similar to that of this gentleman. The effect of a damp climate 

 on the grass of districts in Hawaii (see Mr. Elliot's remarks on 

 pp. 264 and 265) is to render such herbage innutritions. 



I once had in India, a lately-imported five-year old Australian 

 mare, which I put on green grass, as she was in bad condition. 



