A Poisson process in space-time is used to generate a linear Kolmogoro
v's birth-growth model. Points start to form on [0,L] at time zero. Ea
ch newly formed point initiates two bidirectional moving frontiers of
constant speed. New points continue to form on not-yet passed over par
ts of [0,L]. The whole interval will eventually be passed over by the
moving frontiers. Let N-L be the total number of points formed. Quine
and Robinson (1990) showed that if the Poisson process is homogeneous
in space-time, the distribution of (N-L - E[N-L])/root var[N-L] conver
ges weakly to the standard normal distribution. In this paper a simple
r argument is presented to prove this asymptotic normality of N-L for
a more general class of linear Kolmogorov's birth-growth models.