Carrol, Yoshie Help!

[joanna bujes]

...and anyone else who can parse poetry...I'm having trouble: Do "jails" 
refer to schools or the womb? I'm having trouble with lines 3&4; Is "foe" 
in the last line a reference to "mob of solid bliss"?

Thanks/Joanna

                          FROM all the jails the boys and girls

                            Ecstatically leap,

                          Beloved, only afternoon

                            That prison doesn't keep.

                          They storm the earth and stun the air,

                                                              5

                            A mob of solid bliss.

                          Alas! that frowns could lie in wait

                            For such a foe as this!

Emily Dickenson