There are 18 short stories in this book. I have written summaries for 5 of them (because 18 summaries is a very large amount), but I have a list of all of the stories right here.

The Invisible man
The Crystal Egg
The Man Who Could Work Miracles
The Plattner Story
The Strange Orchid
The New Accelerator
The Purple Pileus
The Diamond Maker
The Apple
A Dream of Armageddon
Aepyornis Island
In the Abyss
The Star
The Lord of the Dynamos
The Story of Davidson's eyes
In the Avu Observatory
The Sea Raiders
Filmer