In the \u27\u27Proceedings of the Iowa Academy of Science\u27\u27 for 1916 may be found a somewhat similar title for a paper in which data obtained in July, 1915, were discussed. It is the purpose of the present paper to present the records of a second year. These records were obtained in part for personal information, and in part for reference by students at the laboratory. It is believed that the records (and also those of last year) are sufficiently accurate for use by those studying the limnology of the lake and possibly by those who may work on the heat budget. The computations of volume, given in the last paper, are here omitted. Unfortunately it was not convenient to obtain records the fifteenth of August, nor near that date, the tim...