about four o'clock
`` I 've no doubt I shall be able to help you ; I have a good many beautiful books on botany in the library . I 'll bring the key this afternoon , and unlock the case for you . '' Monica always kept her promises . She arrived about four o'clock , and opened the large glass doors that preserved the handsome calf-bound volumes from dust and dirt . `` Here they are , '' she said . `` Some are very dry and scientific , and some are popular , and have coloured pictures . There are catalogues of plants , and schedules of species , and old herbals , and every kind of book you can imagine that has a bearing on the subject .