liallertjlt. ] 



i.i.i a ML\- 



very small. In the " Forest Flora of the North-West and Central India," Bramli.- 

 that it attains under i'avourablc circumstances, on an average, 2| feet girth iu 12, and 

 4^ feet in 30 years. Since then a t''\v data have been collected, principally from the 

 specimen saplings sent from the runjal) lor tin- Paris Inhibition of 1878. 



The annual lings in the sapwood arc, as a rule, fairly dUtinet; those in the 

 lieartwood arc generally ill-defined : in either case a lens is re.piiml to make them out. 

 The following statement exhibits the rings counted on sections from the Changa- 

 Manga plantation, which were cut in 1877 : 



The calculation has, however, been based on the number of rings counted ; if we 

 take the known age, the number of rings will be respectively 1'5, P5, 1'5, 1'3, 1*7, 1'8, 

 giving an average of 1'55 year per inch of average radius. But these data refer to 

 trees up to 10 years of age onl}', and grown in favourable conditions on irrigated 

 land, so that no further calculation can be derived from them, the measurements of 

 older trees being much wanted. But, assuming this rate of increase of 1'55 ring per 

 inch, we should have at 12 years of age about 4 feet girth, which is a much faster 

 growth than Brandis' estimate. 



The specimens from the Jhelum Sailaba plantations on non -irrigated land gave 

 4 rings per inch of radius average. This would make 30 years to a girth of 4 feet, 

 which is nearly Brandis' estimate. 



The Punjab plantations also give the following information : 



Changa-Manga plantation (Punjab Forest Report, 1876-77. p. 22). 



A Average Average 

 Age - height. girth. 



Vhankara Circle Compartments 6, 5, 8, Block I 



YearH. 



. 6 



Manjoki 



77, to 87 & 99 to 111, Block I 



Ft. 



35 



20 



Inches. 



28 

 9 



Chandra wal, Compartment I 

 Kudsia, ... Ill 



Jaffar Khan, 



Delhi Eela plantation (Mr. M in nikin' s Report, Ib78). 



3 trees . . . . 71 25 to 30 15 



6 20 15 



. 2 12 6 



IV 6 trees 



6 



15-5 



This gives for the Changa-Manga plantation 1*35 to 2*8 rings por inch of radius, 

 and for Delhi Bela 2 to 3 14, or an average of 2'5 rings per inch. This gives a girth 

 of 30 inches at 12 years of age, which is Brandis' estimate. 



A specimen from the Darjeeling Terai, in the Bengal Forest Museum, gives 35 

 rings on a mean diameter of 11 inches, 27 rings being heartwood. 



