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469 



4. Kliainsky, A. 



1910. FuT Morphologie und Physiologie einiger Infusorien (Paira- 



Methode. Arch. Prot., 21, 1-63, ^ 



5. Neresheimer, E. R. 



ten. Arch. Prlt., 2, 305-324, Taf. 7.^ 



6. Taylor, C. V. 



1920, An Accurately Controlable Micropipette. Science, N. S., 51, 

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7. Barber, M. A. 



1914. The Pipette Method in the Isolation of Single Microorganisms 



and in the Inoculation of Substances into Living Cells. Phil. 

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8. Wilson, J. G. 



1910. Intravitam Staining with Methylene Blue. Anat. Eec, 4, 

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10. Tashiro, S. 



1917. A Chemical Sign of Life. Chicago. Univ. of Chicago Press. 

 A NEW MUTATION IN THE HOUSE MOUSE^ 



A NEW and distinct mutation in mammals is not a frequent oc- 

 currence, and therefore the record of a recent dilute form of the 

 house mouse, allelomorphic to color and albinism, is perhaps 

 justifiable. 



The infr('(iu(Micy of nuitMtions in incimmals mny he due to 

 greater s1al)iliTy of ovnn phisni Tli;m in sm-h forms as in- 

 sects, for cx.'iinitlf. lh-<>s(inhilii : m- iii;iy \)o diir to our lack of 

 opportunity tot- .■xaniiniiii:- as lariiv a inipulaTion of mammals 



