Some observations on pecking in pigeons.

An attempt was made to analyse the pecking behaviour in pigeons induced by apomorphine. The pecking was completely suppressed by tranquillizers, barbiturates and cortisone. It was intensified by histamine, nicotine, lobeline, testosterone, progesterone and sodium taurocholate.

Neuromuscular blockade by streptomycin and dihydrostreptomycin.

Both streptomycin and dihydrostreptomycin in large doses produced neuromuscular blockade in different types of skeletal nerve-muscle preparations. Streptomycin had a quicker, more marked and a longer-lasting action than dihydrostreptomycin. Neostigmine reversed a partial block of streptomycin, but a complete neuromuscular block remained unaffected.