Spaying a cat is a form of sterilization to limit the population growth.

[…] Lieutenant Hirsch appeared with a sheaf of signals in his hand. He took these from the young man and read them through. Mostly they dealt with routine matters of the fuelling and victualling, but one from the Third Naval Member’s office was unexpected.

I've looked all over for it.

One of those areas can be found at the city’s northern edge, where the towering smokestacks of Wuhan Iron and Steel loom behind bent-backed farmers tending vegetable patches. Today Qingshan district is a patchwork of tiny fields, polluted streams and roadside markets selling building materials. But the city government is in the process of transforming this no-man’s-land into a sparkling new suburb. Between the steelworks and the mighty Yangtze River, demolished buildings and hoardings advertise a new logistics centre. Down the road, a giant railway station (Wuhan’s third) and a 6-kilometre bridge (the city’s fifth to cross the Yangtze) were completed in 2010.