Dr. Agnew, the celebrated oculist of New York, has indicated his idea of a school for little children, in which health should be a first consideration, as follows: "If we could effect some alterations in the style of school architecture in our school houses, especially the primary departments, it would be a great desideratum. One of the greatest evils at present existing is the method of constructing the school room and of conducting the same. I never could understand why children of the primary age are kept sitting on benches for a large number of hours at a time. School houses ought to be built like the hospital building at the corner of Lexington avenue and Forty-second street, used for cripples, where there is in the upper story a large room, called the solarium, which is in fact a large play room, exposed to the sun, where these little ones are kept the greater part of the time. The upper story of the school houses should be so constructed; and children should be encouraged to bring their toys and playthings with them; and then, instead of changing the age of admission from four years, it might be kept as it is; and instead of shortening the hours of attendance, lengthen them. Of course it should be taken for granted that the school house is constructed for the accommodation of the poor children, and in this light it would be better that such children should spend most of the day in school houses having good sanitary conditions, rather than, as they now do, in tenement houses. Thus you would have these primary schools with plenty of air and light, which you can get in the upper story, and children would be glad to come early, and remain until three or four o'clock, or even later in the afternoon." * * * * * MICROSCOPIC COMPARISON OF BLOOD CORPUSCLES. Dr. J. G. Richardson of Philadelphia, whose views upon the subject of proving blood stains by the use of the microscope have been described in this Miscellany, has lately prepared slides for the microscope so as to show blood corpuscles from two different animals on the same field. He did this by flowing two drops of blood down the slide, and nearly in contact. Dr. C. L. Mees has modified this proceeding. He spreads the blood by Johnston's method, which is to touch a drop of blood to the accurately ground edge of a slide, and then draw it gently over the face of the other slide, leaving a beautifully spread film. In this way one kind of blood is spread upon the slide, and another on the cover. When dry, one half of each is carefully scraped off with a smoothly sharpened knife, and the cover inverted upon the slide in such position as to bring the remaining portions of the film into apposition. When thus prepared the magnified image can be photographed. * * * * * THE SUMMER SCIENTIFIC SCHOOLS.