Allen — The Insulating Properties of Erinoid. 



347 



Table 9. 



White erinoid ; thickness, 053 cm, 



a = 56-8 E. 



These results for white erinoid are much the same as for the black given 



in Table 7. 



Table 10. 



Bed fibre ; thickness, - 5 cm. 



a = 59 E. 



SCIENT. PROC, B.D.S., VOL. XV., NO. XXIX. 



»K 



