Increase ggplot points size

I have two datasets:

mydata1 <- data.frame(Class=letters[1:10], Magnitude = rnorm(10, 3, sd = 1),
                      pValue= abs(rnorm(10, 8, 5)), number= sample (10:50, 10))
mydata2 <- data.frame(Class=letters[1:10], Magnitude = rnorm(10, 2, sd = 0.5),
                      pValue= abs(rnorm(10, 3, 4)), number= sample (10:50, 10))

      

        
        
        
      

    

I am trying to make two plots keeping the same scale between them

ggplot(mydata1, aes(x=Magnitude, y=number, size=pValue, label=Class), guide=F) +
    geom_point() +
    scale_size_continuous(limits=c(0,16), breaks = c(0,2,6,10,16))
ggplot(mydata2, aes(x=Magnitude, y=number, size=pValue, label=Class), guide=F) +
    geom_point() +
    scale_size_continuous(limits=c(0,16), breaks = c(0,2,6,10,16))

      

        
        
        
      

    

My simple question is, how do I increase (proportionally) the size of my glasses? They are too small on the graph. The argument is max_size

not recognized internally scale_size_continuous

.

And if I use

ggplot(mydata2, aes(x=Magnitude, y=number, size=pValue, label=Class), guide=F) +
    geom_point() +
    scale_size_continuous(limits=c(0,16), breaks = c(0,2,6,10,16)) +
    scale_size_area(max_size=8)

      

        
        
        
      

    

it overrides scale_size_continuous

.

Any help is appreciated as I'm running out of options ...