The opening years of the Nineteenth Century mark the first attempts at classifying peaches. By 1818 as many as three classificatory schemes had been proposed, all being modifications of the same general arrangement. July 7, 1818, John Robertson read a paper on classifying peaches and nectarines before the Horticultural Society of London. Later, this was printed in the Transactions of the Society[183] together with a classification by M. Poiteau from the _Bon Jardinier_ and another by Count Lelieur from his _Pomone Francaise_. In January, 1824, George Lindley read before the same society a classification which was but an extension of the older arrangements.[184] Robertson separated peaches into true peaches and nectarines and these in turn into Classes, Divisions and Sub-divisions. He founded the two classes on the presence or absence of glands; for each of his classes he made two divisions distinguished by the size and color of the flowers; each of the four divisions is once redivided into a sub-division in which the flesh parts from the stone and another in which the flesh adheres to the stone. The two French writers use the same characters but found their second division on the adherence or non-adherence of the flesh to the stone; their third on the size of the flower but making three partitions as to size; and their fourth on the presence or absence of glands which they divide into globose and reniform. Lindley created three classes dependent on the presence or absence and the character of the glands and the character of the serrations; three divisions of each class in accordance as to whether the flowers are large, medium-sized or small; two sub-divisions of each division to agree with the presence or absence of down; and for each sub-division two sections, one for clingstones and one for melters. This was the age of the classifier and other classifications, all similar in plan, rapidly followed in England, France, Belgium and Germany. No one at this time seems to have attempted a natural classification of peaches.