68 



PRINCin.ES AND PRACTICE OF PRUNING 



changes between tlie initial period of terminal bud forma- 

 tion (lateral for peach and plum) and the time of flower- 

 ing; (3) the exact date of differentiation of pollen mother- 

 cells and of the similar stage in ovogenesis ; (4j the period 



of origin of pollen 

 grains and of ovules. 



During the growing 

 season buds were se- 

 lected every week or 10 

 da\'s and during the 

 d n r m ant season at 

 l(Tnger intervals. They 

 were killed, fixed, em- 

 b e d d e d , sectioned, 

 stained and mounted 

 according to approved 

 l.'dioratorA' methods and 

 the A'arious stages of 

 growth and develop- 

 m e n t recorded 1iv 

 ])hi it( imicrograjihs, of 

 which the original re- 

 port shows 106. ft is 

 not necessarv liere to 

 detail these metliods, so 

 we Avill jviss to the 



67. General observa- 

 tions. — T li e g r e a t 

 amount of work in- 

 vol\-ed in preparing mi- 

 crosopic sections made 

 it impossible to study a 

 large number of varie- 

 ties. At first four va- 



FIG. 



one- 



-rO'''S'^BF"'"'Y P"AN':HE3, 



YoL'N'j a:;ij I. ; :j 



ar t;rov'll tro'il roo^ Tv'.'o or 

 Ilirue of ti.e stio:,i.':sr of sr.c'i shoofs should 

 f>e alloweH ^o //row l.^-Ii vc;ir to rt'^^la^'e old 

 v.'ood cut -J. If uft r f LI ill". Notice posi'ion 

 of huds and ItPL^'h of spine' — tlircc in a 

 c!us'er. 7[ie l^u.'s ^liould form spurs for 

 ffLiiting next sea;~on. B, r\e-yLar-olJ branch 

 of a much less s-iny yar'etv. Canes shoidd 

 not be allowi d to j^row as old as this, hut be . . 



pruned out «hen three or at most four years nCtlCS of a])pleS, tlirCC 

 old. Bu'l es kept youn^' by sucli pruning are ,. , . , 



usuallv I.ealt! ier than ones in V hich the wood Ol plUm and OUC CaCll 



ir^^^thJ^^U^cr^' ""'•' '""^'""^ °" of peach, pear and 



