On a Formula for Determining the Weight of the Central Nervous System of the Fro
On a Formula for Determining the Weight of the Central Nervous System of the Fro
Henry Herbert Donaldson
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, but it seems probable that a series of records based on averages would coincide more closely than this. On 25 12 Weight of the Central Nervous System of the Frog examining in the leopard frog the percentage deviations, we find in one case (No. 11) exact coincidence, in twelve cases the calculated value is deficient, and in fifteen cases it is in excess. The average value of the deficiencies is 2. 9 per cent. , and of the excesses 2. 5 per cent. These nearly balance, and point therefore to acc...idental causes as the source of the deviations. These results for the leopard frog show that the curves fit somewhat better than in the case of the bullfrog, but the difference is not large nor significant. The state- ments that were made concerning the relations of the curves showing the observed and calculated weights in the bullfrog are also true for the corresponding curves based on the leopard frog. It will be seen (Fig. 1) that in order to get the curves for the two species on the same chart, where they might be compared without being confused, the records for the leopard frog have been shifted 50 grams to the right.
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