On June 1st the chamber was set up in Persikov's laboratory, and he began experimenting avidly by putting frog spawn in the ray.
These experiments produced amazing results.
In the course of forty-eight hours thousands of tadpoles hatched out from the spawn.
But that was not all.
Within another twenty-four hours the tadpoles grew fantastically into such vicious, greedy frogs that half of them were devoured by the other half.
The survivors then began to spawn rapidly and two days later, without the assistance of the ray, a new generation appeared too numerous to count.
Then all hell was let loose in the Professor's laboratory.
The tadpoles slithered out all over the Institute.