. Australian Garden and Field. 106 THE GARDEN AND FIELD. August, 1913 a (Juublc action mounting from the roots through every ramification of !u- tree, to the leaves, in a thin liquid, ..here it is elaborated, and these hav- ing absorbed and decomposed the car- 1 ionic acid, the sap descends again in I changed condition and is deposited \ ear affer year in the successive con- centric layers which form the bulk of the tree. If that be so the sap cannot be said to descend to the roots, but to have been used up in its progress thereto, to, fabricate the body of the tree. Now while this process is
. Australian Garden and Field. 106 THE GARDEN AND FIELD. August, 1913 a (Juublc action mounting from the roots through every ramification of !u- tree, to the leaves, in a thin liquid, ..here it is elaborated, and these hav- ing absorbed and decomposed the car- 1 ionic acid, the sap descends again in I changed condition and is deposited \ ear affer year in the successive con- centric layers which form the bulk of the tree. If that be so the sap cannot be said to descend to the roots, but to have been used up in its progress thereto, to, fabricate the body of the tree. Now while this process is in progress it is easy to-understand that important amputations are the least CURLEW For yeai« iht i)niy llrandy used in t>h« Adelaid* Uoipital. Sol* Agents— DOWNER A 00. Win* and Spirit Merchants and Aerated Water Manufacturers. 4.^ WA^":\TmnnT st., c ity. likely to cause decay, because the ma- terial required to heal them will be produced at once. The practical results obtained by actual experiments fully maintain the correctness of this theory. A number of fruit and ornamental trees pruned at a time of active growth were partly healed of their wounds in ten days, and in a month cuts two to three inches in diameter were completely covered with new bark. Now if these trees had been pruned in the autumn, after the ela- borated sap had performed its annual functions, the wound could not have been healed and would have been af- fected by cold, and decay, instead of growth, would have had the first chance—the trees being dormant would have no latent force to repel this decay, which always commences immediately after all severing of parts when unduly exposed to cold, whe- ther in plants or animals. If the pruning were done at the proper time any application (even coal tar, which is no doubt the least injurious to vegetation) to prevent decay, would be avoided as in the course of the natural development of the tree tht protective covering of the wound would be
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