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DJR. HAKTMAN'S SPRING f ATECHI8M FOB I AMII.V VS E. SCIENCE Aiii:Nnn'i,i;-nitsri,l:v SONS IN PTSIOLOGY. A Complete Explanatlou of the lli . orders Peculiar lo Sprlng-tlme Made Novel and Easy by (hort ituestions and Answers- Strictly Aecnrate In Every Particular. SPKIN3 CATECHISM. Why ia there so much said about blood disorders every spring ? Because of the unusual prevalence of them. Why should impurities of the blood be more common in the spring than at other seasons of the year? There are many reasons, but they can all be traced to one of three distinct sources ? What three sources do you mean ? Atmospheric changes, digestive disturbances, and blood humore. What are the changes of atmosphere peculiar to spring which favor blood impurities ? They are four in number. First, in early spring there is less oxygen in the atmosphere than at any other season of the year; second, there is more moisture in it than at any other season ; third, the electrical disturbances of the atmosphere are greatest in the spring ; and, fourth, the rapid change from invigorating cold of winter to the depressing heat of sumtner occurs (of course) only in the spring of the year. You say there is less oxygen in the atmosphere in early spring; how do you account for that ? Every green leaf not only takes from the atmosphere poisonous gases, but pours into it fresh gen. There are in this climate during the winter only few green leaves to perform their work, consequently the atmosphere becomes greatly contaminated during the winter, and constantly growing more so until the leaves appear again. Is it the want of oxygen that causes that depressed, "tired feeling" one hears so much of at this season? Yes, the oxygen is nature's blood nurifier : and when the air contains less of it than usual the blood becomes heavy with poisonous gases, which more oxygen would neutralize. VVhat is the name of the poisonous gas that oxygen takes out of the blood? Carbonic dioxide, commonly called "carbonic acid." It is the presence of unusual quantities of this gas in ihe blood that produces the tired, languid, sleepy feeling so common in the spring. Is there no help for it but to wait for the green leaves to appear and replenish the air with fresh oxygen ? Yes, there is; Pe-runa is a specific for this condition; it quickens the flagging circulation. which brings the blood into contact with a greater quantity of oxygen and cleanses it oí foul gases. In what way does the increased moisture of spring air favor blood impurities? It is well known to 8cientists that moist air carries spores, disease germs, miasma, and other blood contaminations better than dry air; henee the spring months are especially bad in this respect. Can there be nothing done to protect the system from these dangerous enemies? Nothing but to increase the vigor of the body by using some reliable tonic like Pe-ru-na. Can you explain why it is that during the spring months there is more electrical disturbances than at other seasons? Partly because the air is moister (as moist air is a better conductor of electricity than dry air), and partly because the sun's distance from the earth is less than at any other time of the year, and a portion of its ereat store of electricity is imparted to the earth. How does the increased electrical condition of the atmosphere affect the health of the people? By depressing of the nervous system and lowering the vitality. The symptoms which this causes are nervousness, confusión of the mind, weakness, cold feet and legs, disturbed sleep, specks before the eyes, and so on. Is Pe-ru-na recommended for this condition also? Yes, and it never fails to relieve promptly, as thousands testify who have used it. You mentioned the change from cold to warm weather as having a bad effect on the system; will you explain how? During the winter in order to maintain the heat of the body against the cold more fatty loods are necessary; but, as soon as the weather gets warm, the blood becomes overloaded with unneces sary nutrition, and becomes thick and sluggish. There is more fue than is needed to keep up the animal heat, and it becomes a contamïnation to the blood. What medicine is applicable to this condition? Man-a-lin is exactly adapted to this form of blood impurity, as it stimulates the kidneys and liver to elimínate from the blood 11 superfluous material or poison. (Conduded next week. )