572 Geological Society : — 
Two New Worlds. I. TJie Infra- World. II. TJie Supra- World. 
By E. E. Foubxier d'Albe, B.Sc. London : Longmans, Green, 
& Co. 1907. Pp. vii + 159. 
This intensely interesting and strikingly bold essay on the relativity 
of time and space, and on man's position in the universe, deserves 
to be widely read. " The main thesis of this work " — to quote from 
the author's Preface — u is that a universe constructed on a pattern 
not widely different from ours is encountered on a definite and 
measurable scale of smallness, and another on a correspondingly 
larger scale. To these universes I give the names Infra-World and 
Supra- World respectively." Our " atoms'' are the suns and stars 
of the " Infra-World," while our " electrons " represent its planets. 
An electron may, for aught we know to the contrary, be of as 
complex a structure as our planet, and may be teeming with life. 
Lengths and times in this " Infra- World " are reduced in the 
same ratio of about 10 22 to 1, and absolute velocities are of the 
same order as those in our world. Similarly, our planets form the 
electrons of the " Supra- World," our solar systems its atoms ; the 
ratio of times and magnitudes being again 10 22 to 1, and absolute 
velocities being as before of the same order as ours. Our faculties 
enable us to perceive only three links of the chain of universes. 
The remaining links are concealed from us, and are (to us) at 
present non-material. 
The author writes in an interesting way, and the concluding 
chapters of the book contain many stirring passages. Even to those 
w r ho may not be prepared to agree with the author's conclusions, 
the book will be an intellectual treat. 
LIV. Proceedings of Learned Societies. 
GEOLOGICAL SOCIETY. 
[Continued from p. 204.] 
December 4th, 1907.— Sir Archibald Geikie, K.C.B., D.C.L., Sc.D., 
Sec. E.S., President, in the Chair. 
r pHE following communications were read : — 
1. 4 The Faunal Succession in the Carboniferous Limestone 
(Upper Avonian) of the Midland Area (Xorth Derbyshire and Xorth 
Staffordshire).' By Thomas Franklin Sibly, B.Sc, F.G.S. 
2. ' Brachiopod Homoeomorphv : "Spirifer glaber ".' By S. S. 
Buckman, F.G.S. 
December 18th.— Sir Archibald Geikie, K.C.B., D.C.L., Sc.D., 
Sec. U.S., President, in the Chair. 
The following communications were read : — 
1. « Some Eecent Discoveries of Palaeolithic Implements.' By 
Sir John Evans, K.C.B., D.C.L., LL.D., F.B.S., For.Sec.G.S. 
