The colour-gene-constitution of the albino mouse is usually determined by progeny tests using some tester strains. By the progeny test, however, it is sometimes difficult to classify the mice or progeny, when dilute gene (d) is combined in basic colour genes (A-a and B-b) .
Thereafter, in the present study, detailed observations of all genotypes of 3 pairs of genes (i. e. A-a, B-b and D-d) are carried out with the object of helping the progeny test and their phenotypes of baby and adult mice are described as shown in Tables 1 and 2.
Moreover, as there may exist some confusions in classifing them, especially between dilute brown and dilute cinnamon, dilute black and dilute agouti, and dilute brown and dilute agouti, points for classification are listed in Tables 4 and 5.

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It should be noted that homozygosity for coat colour genes does not represent a purify of the given strain, but heterozygosity for coat colour genes definitely denotes a heterozygous animals.
As all of pure strains are homozygous for the genes, in order to check up and avoid mistakes in mice breeding, testing of the gene constitution may be an effective method.
For the benefit of the testing, two tester strains for coat colour have been bred up and maintained by sib-mating. They are named I-tester, and II-tester and their genetic formulas are as bb CC D/d ss and as bb C/c dd ss respectively.

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Commercial pellets and mixed diets were compared with rabbits for the growth, stability of body temperature, and susceptibility to pyrogen. The commercial pellets seemed to be slightly superior than the mixed diet in any of above 3 respects, although each difference was not so significant. It was concluded that the commercial pellets are available to maintain the rabbits in satisfactory condition to earry out the experiments concerning to a body temperature.

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