[R] Accessing data via url

[John Kane]

#   Can anyone suggest why this works

datafilename <- "http://personality-project.org/r/datasets/maps.mixx.epi.bfi.data"
person.data  <- read.table(datafilename,header=TRUE)

# but this does not?

dd <- "https://sites.google.com/site/jrkrideau/home/general-stores/trees.txt"
treedata <- read.table(dd, header=TRUE)

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Error in file(file, "rt") : cannot open the connection
In addition: Warning message:
In file(file, "rt") : unsupported URL scheme

# I can access both through a hyperlink in OOO Calc. t
#  Thanks