During the Second World War, La Nature was published only erratically. The first interruption in publishing lasted from September 15 to December 15, 1939, with only an additional six issues published during all of 1940.
During the global conflict of World War II, La Nature's regular publication was interrupted, with the first break occurring from September 15 to December 15, 1939. Additionally, a total of six extra issues were released in 1940.