3T8 
gallons of sap, from which are made from five to six pounds of sugar. To 
this there are sometimes remarkable exceptions. Samuel Low, Esq. a Jus¬ 
tice of Peace in Montgomery county, in the state of New York, informed 
Arthur Noble, Esq. that he hadTnade twenty pounds and one ounce of sugar 
between the 14th and 23d of April, in the year 1/89, from a single tree 
that had been tapped several successive years before. 
From the influence which culture has upon forest and other trees, it has 
been supposed, that by transplanting the Sugar Maple tree into a garden, or 
by destroying such other trees as shelter it from the rays of the Sun, the 
quantity of the sap might be increased; and its quality much improved. I 
have heard of one fact which favours this opinion. A farmer in Northampton 
county in the state of Pennsylvania, planted a number of these trees above 
twenty years ago in his meadow, from three gallons of the sap of which he 
obtains every year a pound of sugar. It was remarked formerly that it re¬ 
quired JzW or six gallons of the sap of the trees which grow in the woods, to 
produce the same quantity of sugar. 
The sap distils from the wood of the trees. Trees which have been cut 
down in the winter for the support of the domestic animals of the new 
settlers, yield a considerable quantity of sap as soon as their trunks and limbs 
feel the rays of the Sun in the spring of the year. 
It is in consequence of the sap of these trees being equally diffused 
through every part of them, that they live three years after they are girdled , 
that is, after a circular incision is made through the bark into the substance 
of the tree for the purpose of destroying it. 
It is remarkable that grass thrives better under this tree in a meadow, 
than in a situation exposed to the constant action of the Sun. 
The season for tapping the trees is in February, March, and April, ac¬ 
cording to the weather which occurs in these months. 
Warm days and frosty nights are most favourable to a plentiful discharge 
of sap. The quantity obtained in a day from a tree, is from five gallons to 
* The lnfluence of the weather in increasing and lessening the discharge of the sap from trees is 
very remarkable. 
Dr. l ongue supposed long ago (Philosophical Transactions, No. 68) that changes in the weather 
of every kind might be better ascertained by the discharges of sap from trees than by weatherglasses, 
ave seen a journal of the effects of heat, cold, moisture, drought and thunder upon the discharges 
rom the sugar trees, which disposes me to believe that there is some foundation for Dr. Tongue’s 
opinion. 0 
