Again, we may call attention to the well-known fact that in feeding animals for food, while fat may be laid on in large amounts, flesh cannot be so increased by overfeeding. In this matter, however, race and individuality count for considerable. Thus, there is on record a more recent series of experiments conducted by Dapper[31] on himself which shows some remarkable results. Starting with a daily diet not excessive in amount, he was able by an addition of only 80 grams of starch to accomplish a laying up of 3.32 grams of nitrogen per day for a period of twelve days, or a total gain of 39.8 grams of nitrogen, equal to 248 grams of proteid. It may be said that the gain of proteid or flesh here for the twelve days was no greater than in the preceding case (fifteen days), but the difference lies in the fact that Krug accomplished his gain by increasing the daily intake from 2590 to 4300 calories, an amount which he found too large to be eaten with comfort, while the later investigator raised the fuel value of his daily food from 2930 to only 3250 calories. As the experiments by Dapper contain other points of interest bearing on the question before us, we may advantageously consider them somewhat in detail. The following table gives the more important results: [31] Max Dapper: Ueber Fleischmast beim Menschen. Inaug. Disser. Marburg, 1902. +----+-----+--------------+-------------------+--------+------------------+ |No. | | | Food Composition. | | | |of |Dura-| Character +---------+---------+Nitrogen|Maxima and Minima | |Exp.|tion.| of Food. |Nitrogen.|Calories.|Balance.|of Nitrogen-gain. | +----+-----+--------------+---------+---------+--------+------------------+ | |days | | grams | | grams | grams | | 1 | 6 |Ordinary mixed| 20.25 | 2930 | +2.18 |+3.2 on 4th day. | | | | diet | | | |+1.5 on 6th day. | | | | | | | | | | 2 | 12 |Ditto + 80 | 20.09 | 3250 | +3.32 |+4.75 on 2d day. | | | | grams starch | | | |+4.65 on 12th day.| | | | | | | |+2.30 on 8th day. | | | | | | | | | | 3 | 9 |Ditto + 80 | 24.58 | 3400 | +2.55 |+5.98 on 1st day. | | | | grams starch,| | | |+4.73 on 2d day. | | | | + 40 grams | | | |+0.50 on 6th day. | | | | plasmon | | | |+1.60 on 9th day. | +----+-----+--------------+---------+---------+--------+------------------+