NOTES ON A RECENT BLUE BOOK. 17 practice, and receives a most inadequate salary for his official work, is by no means favourable to efficiency in the perfor- mance of official duties, even when the qualifications of the officer are of the highest kind. He thinks therefore that it would be an advantage if two or more adjacent Rural Districts would combine to secure the services of a Medical Officer bound to devote his whole time to his official duties. Among the concluding recommendations is one that "The District Council should desist as soon as possible from deliberately polluting streams and rivers by the discharge into them of untreated sewage," etc. Then follows a list of places at which sewage purification works should be provided. It is evident that Dr. Fletcher's recommendation that a District Medical Officer of Health should have both a much larger salary and a more extensive area of work than at present would be specially useful in this matter. For at present it is evident that sanitary progress means simply that a village gets rid of an accumulation of sewage by diverting it into the nearest stream. And that when the medical officer has done his duty as regards his own small district he tends to feel that those outside are no concern of his, especially as his private practice necessarily occupies by far the greater part of his time as decidedly the only important source of income. But a medical officer, devoting all his time and attention to a much larger area, would not feel that his duty ended when his own immediate neighbour- hood was freed from sewage accumulation ; but would necessarily feel that his duty obliged him to prevent the absurdity and injustice of benefiting certain villages by plans involving gross injury toothers situated lower down the same stream. Essex naturalists may certainly claim to be among those most interested in the removal of sewage from the Essex rivers, sewage contamination being injurious not only to man and domestic animals but to all the wilder creatures of the land, as well as to the inhabitants of the water. And no result of the proper disposal of sewage will be more generally valued than its establishment of permanently satisfactory relations between man and the oyster.