Fischers Projections of the Stereo-models

Van t Hoff s Table of Signs for the Sixteen Possible Aldohexoses and the Corresponding 

He also predicted from this geometric theory that the reduction of these sixteen aldohexoses would lead to only ten hexitols, of which two would be meso structures [7 = 13 (allitol) and 8 = 14 (dulcitol)], and the 

In the first article I have developed for grape sugar the formula 

However, the designation of arrangement in space as 4- or —, which was introduced by Van t Hoff and retained unchanged by me, can lead easily in case of such complicated molecules to an erroneous interpretation. In order to avoid this I regard it as necessary that a more detailed interpretation of the formula be stated, and for this purpose I begin by designating the four asymmetric carbon atoms through the use of the numbers 1 to 4. 

Fischer did not state his first convention in a fully generalized form instead, he indicated the manner in which he proposed to write the formulas for the three tartaric acids and he then wrote the formulas for the substances of the hexose and pentose series in an analogous way. The following is a free translation of his statement. 

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