64 OBJECT LESSONS IN BOTANY. 
multiplied, its new number is only a repetition of the radical 
number. 
115. Also, when any organ is diminished in number, we 
find generally that the deficiency is only apparent, and does 
not interfere with the law of the radical number. Thus in 
Philadelphus, the one pistil proves to be four growing to- 
gether. In the Lady’s-slipper, the radical number is three, 
and the sepals are three, although the two lower ones are 
united almost to the tip into what seems but one. Thus the 
true number is often curiously disguised by cohesions. 
Fig. 195. Flower of Aconitum Napellus displayed ; s, 8, 8, 8, 8, the five sepals, the 
upper one hooded ; p, p, p, the five petals, of which the two upper are nectaries 
covered by the hood, and the three lower very minute. 
Fig. 196. Flower of Catalpa,—two-lipped, five-lobed. 
Fig. 197. Corolla laid open, showing the perfect stamens and rudimentary. 
116. Again, the five petals of Monk’s-hood (Fig. 195) are 
apparently but two, while three of them are so very small as 
to be overlooked. In the Mint tribe, as Peppermint, Cat- 
115. How does cohesion interfere with the radical number in Philadelphus 
How in the sepals of the Moccasin flower? 
116. How does suppression interfere in Monk’s-hood? In the Mint tribe 
Catalpa? Mustard? What tendency do you see in all these cases? 
