MARINE LABORATORY, PLYMOUTH. 163 
Marine Laboratory, Plymouth.—Report of the Committee, con- 
sisting of Professor A. DENDy (Chairman and Secretary), Sir 
E. Ray LANKESTER, Professor SyDNEY H. Vinss, Mr. E. S. 
GoopricH, and Professor J. P. HILu, appointed to nominate 
competent Naturalists to perform definite pieces of work at 
the Marine Laboratory, Plymouth. 
Since the date of the last report the use of the table has been granted 
to Mr. J. S. Dunkerly for one month for the purpose of investigating 
Protozoa, especially those parasitic in fish. 
Experiments in Inheritance.—Final Report of the Committee, 
consisting of Professor W. A. HERDMAN (Chairman), Mr. R. 
Dovanas Laurie (Secretary), Professor R. C. PUNNETT, and 
Dr. H. W. Marerr Tims, appointed to enable Mr. Laurie 
to conduct such Experiments. (Drawn up by the Secretary.) 
THE experiments were commenced in December 1907 with the object 
set forth in the first interim report presented to the Dublin Meeting of 
the Association in 1908. They were brought to an end in 1911, and 
some of the results summarised in the report to the Portsmouth 
Meeting that year. A more detailed account is now given in ‘this 
final report. 
The data concern in the main two matters: (A) the inheritance of 
yellow coat colour in mice, and (B) the inheritance of dense and 
dilute colourations in mice. 
The following dense colours have come under my notice during 
the experiments: yellow, golden-agouti, cinnamon-agouti, black, and 
chocolate. On the presence and absence hypothesis, 
homozygous golden- -agouti may be represented by zygotic formula yy GG BB Ch Ch. 
33 cinnamon-agouti es 5 ‘ yy GG bb Ch Ch. 
a black A E pa yy gg BB Ch Ch. 
oF chocolate 35 pe oP yy gg bb Ch Ch, 
where Y factor for yellow colour (not barred). 
Il 
G a », barred arrangement of yellow colour found in hairs of 
agouti (grey) mice. 
B PP ;, black colour. 
Ch 5 », chocolate colour. 
Yellow appears to be always heterozygous, and zygotic formule representing 
various kinds of yellow mice may be arrived at by rep'acing yy of the above series 
by Yy. 
Each of the above colours may occur in a dense form, in which the 
pigment is densely deposited, or in a dilute form; these dense and 
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