11255 
TAB IE il 
Specific heat of liquid nitrogen. | 
oe 5 u o i t Dn Re 2 EIS 
Rs) = EEn eat capacity) ‘5 82, Lo 
El == 2 2 lof nitrogen J EE Specific heat | Ë 2 
| No [Sos $5 | 52 fflask andcore) Sw 2% (of nitrogen in) “| Sy 
| sim = 5 ES |Kiz in joules) … & bb: |caljsldegreeK.| “= © 
| Siete lon Wee degree K. Sa Sv | 6= 
| ey _— ~ ln! s co ~ 
| | | E's % <8 
| | | 
29 Nov. | | | | 
Il 41.7 | 63.95 | 0.585 | 112.6 29.5 0.476 6.67 
Ill 4 69.15 | 0.564 116.2 32.8 0.478 6.70 
IV „ | 69.73 | 0.566 | 115.9 33.2 0.474 6.64 
VI 41.6 | 15.465| 0.727 1210 36.4 0.490 6.87 
V i 76.49 | 0.752 117.6 37.0 0.4625 6.48 | 
The values of the atomic heat of liquid nitrogen are also given 
in Fig. 4. 
The sudden increase of the atomic heat at the triple point appears 
to amount to 1.3 cal. 
The value found by us for the specifie heat of liquid nitrogen is 
considerably higher than that given by Aur): 0.480 for the mean 
specific heat between 65° and 77° K. 
Zoology. — “On the phylogenetic significance of the Wing-markings 
in Hepialids’. By J. F. van BrMMELEN. 
(Communicated in the meeting of January 29, 1916). 
My previous investigations of the colour-markings on the wings 
of Lepidoptera have led me to certain conclusions, which may be 
briefly summarised here, as they are needed for the better under- 
standing of the phenomena on the wings of the primitive Hepialid 
family. 
The first conclusion is that the colour-pattern is to be looked upon 
as a mixture of components of different phylogenetic age, and con- 
sequently of unequal systematic value. 
Of the facts on which this conclusion is based, three may be 
mentioned here: 
1. During the development of the wings inside the pupal sheath 
1) H. Aur, Ann. d. Phys. (4) 13 (1904), p. 1010, 
