THE CTPEESS SUB-FAMILY. 



325 



time apparently disappear, and are succeeded by the 

 second system, or what are generally known as the 

 perfect leaves. These are ultimately followed by 



modified leaves in 

 the form of bracts, 

 scales, involucres, 

 &c., which consti- 

 tute the third and 

 last system. 



Figure 42 shows a 

 small sprig of the 

 var. ericoides, in 

 which all the leaves 

 are heath-like, and 

 quite unlike those of 

 the usual form. In 

 this variety the fo- 

 liage remains in the 

 cataphyllary state, 

 or for many years 

 in the condition in 

 which it is in the 

 young plant. 



The change from 

 the foliage of youth 

 to that of maturity, 

 or from the cataphyl- 

 lary to the euphyl- 

 lary state in the 

 Arbor Yitae is shown 

 in the engraving, 



Fig. 41. THUJA OCCIDENTALIS, PASSING 



FROM THE EUPHYLLARY TO THE 



HYPSOPHYLLARY STATE. 



figure 41, while the 

 further change into the hypsophyllary state, or that 

 in which the leaves assume the forms in which we meet 

 them in the parts of the flower, etc., is given in figure 43. 

 These three forms, however, never entirely disappear in 



