For a lot of in the hothouse, each bar has a different number of 8th notes in it. The first 'bar' (denoted by the dotted line) has 9 8th notes in it. I presume this is why he gave the metronome mark for the 8th note instead of the quarter note, since 9 is not evenly divisible by two. You would take the low G# with your right hand in the next bar, another problem with the score is that hand divisions are not always clear and there are a number of redistributions that can be made to make the music easier to play. Case in point, in bar three the last chord in the right hand is too big for many pianists to play without breaking or rolling it, but you can solve this problem by taking the lowest note of the (or two lowest notes) chord with the left hand, since it is not playing anything on that beat and you can hold the left hand chord with the pedal. Later on in this piece however, there are passages that simply cannot be written as played (it would require three hands) and chords often have to be played as grace notes held by the pedal (this first occurs on the first bar of page 6 - how do you play that first beat as written without three hands?). Choosing which chord to play ahead of the beat can be tricky as well.