116v

[Koen G]

If it's translated as Helmut says, then I'd interpret the plummeting rock as drops of milk falling towards the opening of a bucket or a round object. Although the drops actually fall next to the bucket. 

Now I'm imagining a situation where one person spilled goat's milk and another wrote this at his expense. Next time try to catch the goat's milk.

Unless gas can be an abbreviation of ganz, in which case it's next time try to take the milk completely. 

Edit: also, if this is addressing someone, that means he used Voynichese script to write the guy's name!