52 



SIR ROBERT CHRISTISON AND DR CHRISTISON ON THE 



At the conclusion of the growing season the limit is probably more fixed. 

 Neither in 1880 nor in 1881 was a greater increase than a twentieth of an inch 

 recorded in any tree in September. So small an amount as this comes within 



Table IV. — Monthly Increase in Girth of Twenty-Eight Leaf-Shedding Trees in the 

 Botanic Garden, Arboretum, and at Craigiehall in 1882. 







Increments 



in hundredths of an 



inch. 



No. 



Trees. 



Girth 31st 

 March. 

























May. June. 



July. 



August. 



7 



Beech, ..... 



75-05 



•10 



35 



•40 



•30 



8 



• • • • 



64-30 



•15 



30 



•30 



•35 



14 



>j ■ ' 



77-85 



•05 



20 



•20 



•15 



38 



)> • * 



62-00 



•00 



15 



•30 



•05 



8 - 



Craigiehall, 



13615 



•00 





•25 



•15 



9 



j> » ... 



118-45 



•10 



15 



•25 



•15 



14 



a >» ... 



63-70 



•15 



10 



•25 



•20 



15 



jj a ... 



74-30 



•15 



20 



•30 



•20 



22 



j) >"> ... 



98-35 



•10 



10 



•20 



•05 



40 



Hungary oak, .... 



30-35 



•30 



45 



•60 



•50 



54 



>>>>••■ 



19-15 



•35 



50 



•55 



•50 



55 



>y ff f * • 



16-30 



•65 



•12 



•50 



•20 



44 



American oak, .... 



32-55 



•15 



•10 



•15 



•00 



43 



Turkish oak, .... 



44-20 



•10 



■15 



•30 



•15 



10 



„ „ Craigiehall, . 



74-95 



•20 



•20 



•30 



•20 



12 



English oak, .... 



7115 



■05 



•05 



•10 



•15 



33 



Hornbeam, .... 



45-90 



•15 



•15 



15 



•05 



28 



Sycamore, 



59-75 



•00 



•25 



•15 



•05 



58 



it * * 



63-50 



•00 



•05 



•05 



•00 



7 



„ Craigiehall, 



127-75 



•00 



•25 



•15 



•05 



18 



Lime, ..... 



44-20 



•05 



•15 



•20 



•00 



21 



„ Craigiehall, 



100-35 



•00 



•05 



•15 



•25 



3 



Ash, 



77-35 



•20 



•15 



•15 



•00 



6 



„ Craigiehall, 



141-40 



- -10 



15 



•05 



•05 



4 



Spanish chestnut, 



74-75 



•05 



•20 



•30 



•35 



9 



Horse chestnut, 



51-05 



•00 



•05 



•05 



•00 



6 



Tulip tree, .... 



78-15 



■00 



•05 



•20 



•25 



5 



Birch, Craigiehall, 



57-15 



•00 



•15 



•20 



•10 

 •16 



Average of the 28 trees, 





•11 



•18 



•24 



„ 3 Hungary oaks, 



. . . 



•43 



•37 



•53 



•40 



„ 25 others, .... 





•07 



15 



■20 



•13 



„ 9 Beeches, .... 





•09 



•19 



•27 



•18 



• Monthly percentage of 28 trees, . 





16 



26 



35 



23 



„ „ '■'< Hungary oaks, 





25 



20 



31 



24 



„ 25 others, 





13 



27 



36 



24 



„ „ 9 Beeches, . 





12 



26 



37 



25 



the limit of probable error ; it may be doubted, therefore, whether any increase 

 really took place in that month ; but as the differences between the records of 



