262 REPORTS ON THE STATE OP SCIENCE. — 1920. 



records, they fully confirm the recessiveness of the melanic variety. In the F, 

 generation there appears to be a difference in the distribution of the black 

 pigment between the two sexes. This is being investigated by means of camera 

 lucida drawings of the Fi generation, from which a calculation of the black 

 areas may be obtained by means of a planimeter. 



A. grossulariata var. lacticolor and var. varleyata. — The combination of these 

 two characters in the same zygote produces a new and very beautifully marked 

 variety, named var. exquisita. 



If T=type, and i = varleyata, and if G = type, and g=1acticolor, 



then cJ type = TTGG, ? type = TTGg 



(? varleyata^ ttGG, $ varleijota = ttGg 

 3 lacticolor = TTgg, ? lacticolor = TTgg 

 (J exquisita = ttgg, $ exquisita = ttgg 



Therefore TtGg X TtGg should give a 9:3:3:1 ratio of type, varleyata, 

 lacticolor and exquisita, but, owing to the spurious allelomorphism in the F, 

 generation, the sex ratios will not be normal. Experiments are being made to 

 test this. Up to the present, though the numbers are small, owing to the 

 unfortunate incidence of disease, an excess of type and varleyata individuals is 

 indicated. 



It is hoped, if possible, to complete the experiments indicated above next 

 year. It is also suggested that, in the event of material being procurable from 

 Germany, experiments might be initiated to elucidate the inheritance of Aglia tan 

 and its var. lugens. 



Committee to co-operate with Local Committees in Excavations on 

 Roman Sites in Britain. — (Sir W. Eidgeway, Chairman; Mr. 

 H. J. E. Peake, Secretary; Dr. T. Ashby, Mr. Willoughby 

 Gardner, Prof. J. L. Myres). 



Owing to the war the Committee has been in suspense since 1914, when all 

 excavations in the Hill Fort in Kinmel Park, which was being explored by the 

 Abergele Antiquarian Association and the Cambrian Archaeological Association 

 in co-operation with this Committee, came to an end. 



Although the Committee had not been revived in 1919, and therefore no 

 grant was available, Mr. Willoughby Gardner reopened his investigations in 

 November 1919, and has supplied the Committee with a detailed report of 

 them. 



The Committee asks to be reappointed. 



Ahsiract of Report on Further Excavations in Di^iorhen, the Ancient 

 Hill-Fort in Parch-y-Meirch Wood, Kinmel Parle, Abergele, 

 ■ N. Wales, during 1920. 



By Willoughby Gardner, F.S. A. 



The excavations in this native hill-fort (see Reports of the British Associa- 

 tion, 1912, 1913, and 1915) were reonened in November 1919. A first obiective 

 was the further investigation of the huge main rampart. Attention was directed 

 to the cutting through it on the S.W. . ivhere archpeological 'floors' and con- 

 structions belonging to two occupations, A and B. had been previously dis- 

 covered, and where the top course of a wall belonging to an earlier construction 

 had been found beneath the lower Floor B. Before we could excavate this it 

 was necessary to widen our cutting considerably, thus enabling us to examine 

 further areas of Floors A and B. In the uppermost. A, more relics of the 

 fourth century were found. Below it the revetting wall excavated in 1914 was 



