Plate IX 



1 _ \ 







^w- 4^ 



P344 

 k 



F 



J-L 





J-iy.4-0- 



;; A 



SG 



Plate 1 8 from Hales's Vegetable Staticks 



Fig. 40. Instrument devised by Hales to make prick- 

 marks on a young shoot of Vine (Fig. 41); the 

 distribution of stretching after growth is shown in 

 Fig. 42. The use of a similar instrument for 

 marking surfaces is shown in Figs. 43 and 44 



