In the early 1960s, economist CD. Deshmukh came to me with some seeds of acacia and eucalyptus. He was worried because the seeds had failed to germinate. I x-rayed the seeds and found their embryos normal. So I treated the seeds with acid and thinned their thick coat. After this, Deshmukh was able to germinate the seeds, and acacia and eucalyptus trees grew all over Delhi.