404. That’s an error.

The requested URL /translate_c?act=url&depth=1&hl=fr&ie=UTF8&prev=_t&rurl=translate.google.com&sl=fr&tl=en&u=http://books.google.com/books%3Fid%3DiR0g_41022sC%26lpg%3DPA242%26dq%3Dneurones%2520photor%25C3%25A9cepteurs%26hl%3Dfr%26pg%3DPA242&usg=ALkJrhjSKHLxSI9AISpzw4t8xECarCCaXA was not found on this server. That’s all we know.