. Journal of comparative neurology . .81 , 32 9 3 days 35 61 7 days 32 3 2 weeks 31 3 3 weeks 31 0 4 weeks 31 2 Average percentage gain 1 Maximum weight increase. tion. This seems probable from the results obtained in the secondset of experiments in this series which show that a weak acidsolution of formaldehyde causes a greater amount of swellingthan does a stronger one. The final weight
. Journal of comparative neurology . .81 , 32 9 3 days 35 61 7 days 32 3 2 weeks 31 3 3 weeks 31 0 4 weeks 31 2 Average percentage gain 1 Maximum weight increase. tion. This seems probable from the results obtained in the secondset of experiments in this series which show that a weak acidsolution of formaldehyde causes a greater amount of swellingthan does a stronger one. The final weight changes for the various groups of brains areplotted in the graphs in chart 6. Table 7 gives the data obtained in the experiments in whichbrains of different ages remained for four weeks in 20 cc. of anon-neutralized solution of 4 per cent formaldehyde. In this instance brains of new-born rats do not show suchstriking weight changes as are shown in table 5. The initial rise 298 HELEN DEAN KING Age of rat. Percentage weight Time in days. Age of rat, Ne^Af born. - 10 days. - 20 days. 100 days. -200 days. Chart 6 Showing the weight changes in brains of rats of various ages, eachkept for four weeks in 20 cc. of a neutralized solution of 4 per cent formaldehyde. 60 Age of rat10 days200 30 Percentage weight increase.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedicine, bookyear191
