106 



In paragraphs 11, 12 and 13 the multinodal cyme and se- 

 rial cyme are treated of, as also the kind of cyme in the chief 

 natural families enumerated, and in conclusion the following 

 consequences drawn : 



1 . The accessory gem originates between a branch and its 

 primitive leaf, proceeds from this branch in the same way as 

 that from the central stem, and its primitive spiral has the 

 same primitive leaf for its point of departure. 



2. The other inferior accessory gems likewise grow the one 

 from the other ; the same leaf serves them in succession as a 

 primitive leaf. 



3. The gem produced between the branch and the axis 

 may proceed from a vital node situated at the base of the 

 branch and normally opposite to that of the angle of the leaf; 

 or the branch is accessory to the gem, this latter remaining 

 more or less stationary or becoming abortive. 



4. The central axis, the principal branch, and the acces- 

 sory branches may cohere in various ways among them- 

 selves. 



5. The serial cyme is composed of peduncles superposed in 

 this way : when these peduncles have their lateral vital nodes 

 sterile, the serial cyme is simple, in the contrary case it is 

 compound. 



6. The accessory peduncle has constantly at least as many 

 vital nodes beneath its flower as the peduncles produced from 

 the first or second node of the central peduncle have beneath 

 theirs : when this number is very considerable, it may be 

 regarded as a leafy branch. 



7. The multiple axillary embryos proceed directly or indi- 

 rectly from a central axillary embryo ; this latter is solitary in 

 the angle of the leaf. 



Finally, in paragraphs 14, 15 and 16, the thyrsus, the sir- 

 mentide, the laws of homodromy and antidromy are explained, 

 from which the following conclusions are drawn : 



1. When the successive axes of centrifugal inflorescences 

 have a small number of lateral nodes, generally two or four, 

 the second node is antidromous with the first, the third with 

 the second, and the fourth with the third, and so on : these 

 antidromes are the less constant as we arrive at axillary gems 

 whose numerical order is higher. 



