The cloud-chamber has a volume 30×30×10 cm3 in a maguetic field of 6200 gauss, which is operated at a 3185m mountain altitude. In a set of 30000 pairs of photographs taken, 105 events of the decay of neutral V particles and 21 of the decay of charged particles wore observed. It is seen that 16 events have been classified as due to the decay of ∧0 particles, 26 as due to the decay of θ10 particles, one as decay of a θ20 particle and 62 as nonclassified. We have studied the following properties of the ∧0 and θ0 particles, the results of which are summamed as follows: 1) Q values Q(Λ0)=(36.2±2.5)Mev, Q(θ10)=(233±11)Mev; 2)mean lifotimes τ(Λ0)=(3.19-0.92+2.42)×10-10sec,τ(θ10)=(1.14-0.27+0.49)×10-10sec; 3) The Momentum distributions found for ∧0 and θ0 particles have no appreciable difference with earlier results;4) N(∧0)/N(θ10)=0.51±0.22 (corrected number in lead);5) The angular distributions of the decay products of the ∧0 and θ0 particles in the rest system have no marked asymmetry;6) The lifetime of one θ20 particle is estimated to be :10-9 sec. in the rest system. The decay mode of this θ20 particle is probably θ20→π-+π++π0 or θ20→π±+μ?+ν.
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