200 Miss Dale, On certain outgrowths (Intumescences) 



number on the next five. Of these five, the three lower had 

 outgrowths only on the under side, and the two upper on both 

 sides. Of the remaining three leaves two had slight outgrowths 

 above, and the youngest leaf had none. 



The Plant in the Tropical Orchid House. The lowest eight of 

 the remaining leaves had a few outgrowths, the next three were 

 more thickly covered, then followed a leaf with a few outgrowths 

 and another with many. In the last six leaves the outgrowths 

 were confined to the lower surface. The remaining four leaves 

 had outgrowths only on the under sides, and all but the last but 

 two had only a few. 



The Plant in the Cactus House. This was more thickly but 

 more irregularly covered with outgrowths than any of the others. 

 The lowest remaining leaf was devoid of outgrowths. It was 

 followed by two which were thickly covered, one on both sides, 

 one only on the upper surface. Then came a succession of twelve 

 leaves; all having some, in many cases numerous, outgrowths, either 

 on both surfaces or only on the upper surface. The stem, petioles, 

 and capsules were also thickly covered. 



The Plant in the Filmy Fern House. This plant was almost 

 entirely free from outgrowths, but was very weak and unhealthy. 

 The stem was tall and relatively thin ; the leaves small and limp ; 

 the flowers for the most part had dropped off before opening. 



Plant A in the Intermediate Pit. This plant had not changed 

 much since June 9th. At the earlier date the first seven leaves 

 were free from outgrowths, the eighth had merely a rough surface, 

 the ninth had many outgrowths, the tenth very few and the 

 eleventh none. At the later date there were thirteen leaves. 

 Some of the lower leaves which were recorded on June 12th had 

 fallen off and all those which remained had some outgrowths. 

 The leaves on the middle part of the stem had most outgrowths, 

 while the young ones at the top had few or none. 



The stem was fairly thickly covered and the carpels had many 

 of large size. 



Plant B in the Intermediate Pit. This was almost exactly like 

 the one which has just been described. 



It may here be noted in passing that the old plants from 

 which the material had been obtained for the anatomical in- 

 vestigations and which had been growing in the Intermediate 

 Pit, were during the spring and summer exceedingly thickly 

 covered with outgrowths. In some cases the leaves which were 

 small, drooping and curled, suggested those of Mesembryanthemum 

 crystallinum because they were so crowded with outgrowths (fig. 

 22). But the nature of the outgrowths in the two plants is very 



