  In a recent article on stretched polymers in a poor solvent by Grassberger
and Hsu \cite{grassberger2002a-a} questions were raised as to the conclusions
that can be drawn from currently proposed scaling theory for a single polymer
in various types of solution in two and three dimensions. Here we summarise the
crossover theory predicted for low dimensions and clarify the scaling arguments
that relate thermal exponents for quantities on approaching the $\theta$-point
from low temperatures to those associated with the asymptotics in polymer
length at the $\theta$-point itself.
