44 Mr. Philip Crowley. 
g.—NoTES AS TO THE FLow oF SAP FROM THE CuT BRANCH 
oF A Bircw TREE (B. ALBA). 
By Puitip CRowLEY. 
[Read April 16th, 1879.] 
At 7 a.m. on the morning of Saturday, March 2gth last, 
a small branch about one inch in diameter was cut off a birch 
tree in my garden by my gardener. The tree from which it 
was cut was about six inches in diameter at a height of five 
feet from the ground. About 9.30 I noticed that the tree was 
bleeding freely from the cut branch, and in the afternoon I 
showed the tree to our President, Mr. Flower. At 10.40 a.m. 
on March 30th I placed a vessel to catch the sap that dripped 
from the bough. Between 10.40 a.m. and 1.40 p.m. I0 ozs. 
had flowed into the vessel, and by 9.40 p.m. 16} ozs. more. 
I recorded daily the quantity of sap which flowed from the 
tree up to the morning of April 6th, when the flow was much 
lessened, and rain prevented my measuring it correctly. Even 
now, more than 18 days after the branch was cut off, there is 
some drip from it, but not much. The following is my record 
of the quantity of sap :— 
March 30_ ... 10.40 a.m. to 9.40 p.m. ... 264 ozs. 
Pe Oa ae OO DP Dls) goa. Sate 
April 1 4 OL O° pie tea: sees 
Be 2 7 OO _pim Booty 
” 3 , 6 0 p.m Blah ee 
> 4 y 6. 0 pm ABs 5 
a 5 FAO. PORP Meena Sore 
6 pilOn Ova. iil. 31 ~ 
Add from the period from 7 a.m. on March 
29th, when the bough was cut, to 10.40 
a.m. on March 30th, when I first began to 
measure the sap ... ae bed VOD LES 
Total 46 woe peat Og aaa 
—Taking 20 ozs. to a pint, this would be equal to 21 33 pints, 
or from 2} to 3 pints every 24 hours. On April 7th, in three 
hours of fine weather, the flow of sap was 40zs. On April 
8th and gth it was only about 15 ozs. in the 24 hours. 
