UMalflf tfhiottg. 297 
The Ixia cinnamomea gives out its fragrance in the 
evening only; the highly-scented Lesser Orpine ( Cras- 
sulu odoratissima ) only in the night; the Epidendrum 
fragrans, morning and evening; another species of 
Epidendrum, hung up in a room, without earth or 
water, yields an agreeable perfume for years. The 
flowers of the Hebenstreitia dentata are scentless in the 
morning, have a disagreeable smell at noon, and give 
out in the evening a fragrant odour, not unlike that of 
the Hyacinth. 
These properties of flowers, and the opening and 
shutting of many at particular times of the day, led to 
the idea of planting them in such a manner as to indi¬ 
cate the succession of the hours, and to make them 
supply the place of a watch or clock. Those who are 
disposed to try the experiment may easily compose such 
a dial by consulting the following table, comprehending 
the hours between three in the morning and eight in 
the evening. 
