EXPERIMENT STATION REPORT. 267 



In the ash there is a similar difference Ijetween the old and 

 the new growth of the year. Thus the end leaves of the old 

 wood are 18 cm. long with six pairs of small oval leaflets while 

 the next leaf and usually directly above it is 35 cm. long bear- 

 ing seven pairs of broad leaflets. 



In short, these nursery forest trees show that the foliage 

 that was formed during the premature ripening period w^as very 

 much smaller than the normal and was followed by a continua- 

 tion of the same stems with leaves that were quite different in. 

 form but that as the twigs continued to thrive, the normal form 

 was again approximated. The foliage in the portion of the stem 

 most active during the checked and revived period was below the 

 normal in size and the form changed materially with the first leaf 

 upon the new growth, the chief distinction being the shortened 

 axis and a broader ecjuatorial diameter. 



Plate XXI may help to bring to the eye some of the observa- 

 tions under consideration. At i is shown a privet twig cut close 

 to the stem from which it grew laterally ; some of the leaves had 

 fallen, both at the base and at the middle portion which marks 

 the retarded growth above mentioned, and the differences are 

 evident only in a general way. It is seen that the internodes 

 are shorter in the zone of retardation (2) ; in other words, there 

 was in this way made a record of the checked growth which is 

 also shown in the smaller leaves as the cessation point is ap- 

 proached from the base. With the renewed growth there was 

 an increase in the length of the internodes but the first pair of 

 leaves was small and one had fallen. It is further noted that 

 the leaves of the later growth are larger and more pointed than 

 the corresponding ones below the cessation point. 



At 3 is shown a twig of Forsythia (Forsythia viridissirna 

 Lindl.) which admits of a clearer photograph than its relative 

 the privet. The cessation zone is evident chiefly from the re- 

 duced size of the leaves. This species has its first leaves from a 

 winter bud without further serration and this entire margin is 

 evident in the small leaves that form first after growth is re- 

 newed, even with those of nearly normal size. All leaves have the 

 lower third smooth-margined and apparently this is associated 

 with the early growth of a bud that has prepared' 'itself for a 

 quiescent life and whether it is a result of vernation or food 

 supply or both, along with other factors, remains for deter- 

 mination. 



The pendulous Forsythia (F. siispensa Vohl.) is represented 

 at 5, where only the middle portion of a ten-foot branch is shown. 

 In this species the foliage is more variable than in the last, the 



